I've done about 5 cabinets. Most recently Taxi. I use the wet method and have been real happy with it.
A few things I'd suggest:
I use the plastic squeegees from Tap Plastic (a little larger than a credit card). I cut the square edges round w scissors. Those square edges can and will scratch most shiny / glossy artwork.
In addition, I put on a soft edge on the squeegee, like he did on video of post #12. Note: he did the bottom half of front with protected felt, then had the squeegee upside down for the top half. You can even hear the difference in his application. This proection can be done with the sticky felt (like his in the vid.), soft side of velcro or the felt material used to protect the inside of pin cabinet's painted or decaled inside art.
I recommend cleaning both the cabinet and the paper side of the artwork. Paper side of decal has dust and lint on it that will land on your smooth cabinet and look like pimples when you're done.
I use the filler in the coin door, I made with MDF. This allows the artwork something to rest on and doesn't pull the thinner cabinet edges, especially top of coin door opening.
I use an exacto pen knife blade for trim. I find I can easily press the blade hard and flat against cabinet for a clean straight cut.
I've seen air bubbles in both dry & wet method. I use a heat gun (not hair blow dryer) on a low setting, to heat the artwork. Most of the time it will shrink bubbles. My Taxi even started to get slight new bubbles with the heat, but they all went away The other times it will soften bubble and allow you to take a pin to pop and massage air out. I have removed these bubbles 1-2 days later, after it has dried and settled down.
I'd recommend doing the smaller panels first (the head sides). Then depending on your artwork, the front next and the cabinet sides last. The front before the sides, because many will need to marry the side's art to the front. It's critical the front be done first for that reason (especially Indiana Jones)
I was very nervousness on my first cab... but it went well. Anyone have any other tips to add? I'm going to be doing my DINER next, then Bad Cats.