For what it's worth, my first experience of edge banding.
I did the individual panels before assembly , then I don;t end up hacking away at the corners, where panels meet.
The Domestic Iron is rubbish, you can't feel what is happening and the Old Dragon Lady disapproved immensely.
My method involves my Dewalt Heat Gun, and a rubber roller found in the decorating box.
When I apply heat, I can see the binding deform and the glue is soft, I apply the roller and keep rolling until it cools enough to set.
The best way is to tack the far end first and let it set, then leave that end.
Then I go down the full length slowly heating and rolling as I go.
This way, I can see where the glue has "taken" because under the lighting I can see a ridge where the glue hasn't been rolled yet.
I bought an Axminster Trimmer and was quite disappointed because it was so hit and miss to adjust the blades.
I got one blade correct, so I just did one side at a time but even then it was a bit jerky with no "feel".
It is far better to use a new stanley blade, holding at around 45deg, I can drag the blade down the edge binding taking a nice neat strip all in one go.
I found that if you hold the ground bevel of the stanley blade to the ply surface, there is no tendancy to dig in at all.
There you go, what I need now is a bi flat MFT Table as I can't seem to get repeatable accuracy with my Table Saw.
Then I can do the whole kitchen with custom size cupboards and drawers.
cheers
Howard