If you're using Model Master clear lacquer, just get some lacquer thinner and thin it to about a 1:1 ratio. Very easy. Test it out on some scrap before you shoot your model.
I keep an old Monogram P-47 around to test on. Picked it up at a drug store for $2 and just slapped the wings, fuselage, cowl and elevators together. It's the guinea pig for every new technique I try.
The only way to improve is to try new techniques. Don't be intimidated.