I've only done decals 1.5 times
The actual application of the decals (if done slowly and with another person to help) I think is the easy part. I've done both the wet and dry method and would do either again.
The time consuming part is the cabinet preparation. Lots of sanding, filling etc....I used a belt sander to remove the decals on my HS2 and I think this caused me more work in the long run. Definately use heat gun next time to remove old decals.