As Phil says, if you are asking this question, you may find a kitchen refit very challenging.
There is much more to it than just fitting cupboards - all the plumbing (water and gas probably), and electrics that must be right because it's a place where water and electricity come rather too close to each other! I know one very good woodworker on here who is getting professionals in to do his own kitchen, even though he has done several himself in the past. And I would do the same if I could.
OK, that said, if you are quick to learn, I'd also say, "go for it!". We learn by doing, and if you are young and fit, it will be a great learning experience for you.
But the biggest single "tool" you need is VERY careful planning. You will need to check all the services (water, air extraction, gas and electricity, in order of most awkward first), that you know exactly where they come into the room, and where you will be moving them to, and what size pipes are, etc. Don't guess - measure and test everything you can, especially in old properties, where the copper pipes might not be metric sizes! You also need to know how strong your walls and floor are (for fixing cupboards and floor units, and if you are buying pack-flat, roughly where the legs will stand. If you cannot get good, detailed drawings (with measurements on them!) from the kitchen supplier, that is a very good argument for buying from someone else!
If you will live in the house at the same time, you need a plan for how you will manage without a kitchen while it is being done. And you will need space for all the kitchen crockery, movable furniture and stuff, and space to keep the new kitchen parts so you're not falling over them while you try to install them. And if it's a flat that is NOT on the ground floor, you need to be extra careful of work under the floor, and avoid water leaks at all costs - have a "leak management kit" ready at all times (bucket, sponges and lots of old towels), as you may "discover" piping you don't especially like! Know where the water and gas stop-taps are (and make sure they work), before you start!
You cannot nowadays DIY the whole thing, as some parts of the work require a professional (gas and electricity). So you need a proper plan, of what you intend to do, in what order, and when you need those trades on-site.
You may have herd the terms "first fix" and "second fix". In the first one you're getting services to roughly where they need to be, in the second you're doing the actual connecting up and finishing off neatly. So your specialists will probably need to visit at least twice.
You also need to check your layout with them, as there are rules, for example how close electric fittings can be to a sink, and about extraction for a hob - you need to make sure your layout is legal and do-able. My strong recommendation nowadays would be to use a 3D modelling tool like SketchUp to do a virtual refit first. It can be as accurate as you want, and it's a very good way to check issues like plumbing and other services will actually work, before you start with the crowbars, etc., and rip the old one out. It's free, and there are lots of tutorials on-line.
Your other major "tool" is a second, strong pair of hands. There are a number of essential tasks that you really can't easily do single-handed - fitting big worktops and hanging wall cupboards (much easier with two people, usually) spring to mind. Someone who doesn't mind being yelled at in a crisis (we all do it!), and is very sensible...
You also need a lot of dust sheets and soft things to cover fragile things like tiling and work surfaces once they're in place, while you work alongside or over them. If the floor will be tiled first, I'd put 9mm ply on top as a minimum protection, until the rest is done - be very careful of point loads punching down through even then.
Regarding actual tools, which parts of the fit are you going to do yourself, how much adjustment will you expect to do, to things like carcases, etc., and are there good hire shops near you? The bigger and more specialist tools (like heavy drills and worktop cutting jigs) can be hired.
You can probably guess that a lot of the above comes from hard lessons learned! I've since found a few really good books on kitchens, from a woodworker's perspective, but if you browse Amazon don't forget that the USA does it quite differently from here (especially electrics and water stuff), so what you read isn't always applicable. Lots on YouTube too, I daresay.
HTH, E.
(trying to be realistic, not a wet blanket!)