I can do one over the next week or so if I get time, are you after a full tutorial e.g. how to source a paintkit, download gimp, find aircraft logos, colours and branding online. Or are you after a livery construction tutorial on once you have these things how do you put them into the file in the correct way for the livery to look fairly realistic?
There is a few basic tutorials on youtube such as this, but it doesn't have a voice over or captions (just notepad text) and doesn't create a realistic livery (with logos and branding etc).