First job is to remove windows & doors, I use nail polish remover (acetone). Only make sure you use it on a base paint as have found it
removes any other layer of paint that has been put on top. Being one of the blank models should be OK. I have read some of the newer
models may have a coating on top of the printing that may cause a problem.
I would leave cockpit as is. As that yellow covers a large area, I would use a yellow spray can to get a better finish than hand brushing.
Using masking tape to get a defined edge. Assume you are getting 1/200 Kalitta/DHL decals, once applied I would give model a coat of
Klear or gloss varnish to seal decals.
That’s about it in a nutshell. Although in reality, there’s a bit more too it. I started after a lengthy gap from the plastic kit world & took
awhile to get my hand back.
Welcome to the world of DIY!