"Scotch" = Pearl, liquid hide glue, animal glue, and I'm sure there are a few other names for it as well.
If you are going to use scotch, you only need to wet the veneer, place paper between the leaves (brown or wallpaper lining paper ) and place it between two boards with a heavy weight on top over night. Only take the veneer out when you are ready to use it otherwise it may curl up again.
When you are ready to lay down the veneer, make sure your glue has been on the heat for at least three or four hours and scrape the scum off the top every half hour or so until you get a semi opaque stained glass like crust on the top. Your glue wants to be on the thin side too but not too thin. Make sure you have about a 1/4" overhang on your veneer to allow for shrinkage as you will always get more with a burr. Coat each surface generously with glue and work quickly before it gels. When you have the veneer in place push it down initially with the palm of your hand then wet the surface but do not soak it, run your electric iron quickly over the veneer with a light sweeping motion. Now place your hand on one side of the veneer and with your veneer hammer start to work the glue out to one side. When you have reached the edge clean off the excess glue with a brush or rag and warm water then place your hand on the side you have just worked and hammer the other side.
Next pour yourself a glass of "Irish" to celebrate a job well done!