Some people use high density foam
(insulation board) as the filler instead of wood.

For me I just cut slot on the inside of the coin door opening along the edge of the decal and either tape or clamp it to the cabinet. I apply one half then the other. Never had an issue...

The intent of those is to use them as alignment. They should be lined up with the edges of the cabinet ...but they are not always perfect. There is always a bit of judgement involved. Start with the hash marks and see if your decal appears to be aligned right (on all sides and the coin door opening). Meaning ... after you trim it will it be straight and completely covering the face on all sides?

If you spend a lot of time in the alignment step you are doing it right... Especially if it’s your first time. Just double, triple, quadruple check it. You got one shot at it.

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Yeah sand! Don’t use anything lower than 80 grit.

80 (get the goo off)
120 (clean off any remains of goo)
220 (finish sand)

You can really feel and tell if you’ve done it right. You will see little balls of debris when you are stripping that goo ... once you’ve gotten through it you will start producing dust. Look at it under light and literally feel it to see if you’ve gotten it all. It all has to come off.

There are few ways to deal with it. I prefer to not use anything that would penetrate the wood. Just a preference.

If it were me... using rapid tac, I would make sure it’s entirely painted. I’d prime the whole thing and then paint black along the edges.

I’ve found that putting the first coat of primer down will sometimes reveal finish spots that were missed and any corner problems you may have missed. It can be tough to see everything that needs to be corrected on a bare wood surface.