My first conversion project

Since the only 1/48 F-20 Tigershark model on the market is OOP (at least among the major companies), I decided that it would be a good subject for my first conversion project. So I’ll likely be converting an F-5E (my LHS is also going to see if they can find the Monogram Tigershark) into the later model. Can anyone tell me what to expect in terms of modifications to the F-5E model? I’ll obiously have to do some research of my own, but what can I expect to be doing in general?