In modelling, like anything else, you tend to learn by doing - I still say if you want to have a go with resin then give it a go, but maybe start with something less arduous than a full resin cockpit on your first go - leave that for your second build!
In my humble opinion (and bare in mind I hate working with PE and Resin), I've never much seen the point of fitting a full resin cockpit to something like a 1/48 WWII fighter anyway, because even with the canopy open chances are you won't see most of it (1/32's a different story however). If you want to lift a cockpit, to my mind you want to concentrate on the visible aspects, so a good IP, seatbelts and a decent paint finish will work wonders.
If you wanted to dip your toe in the resin pool, Ultracast (in Canada) do a really nice P-51D seat with moulded belts. I suspect it's for the Tamiya kit but I'm sure you could make it fit. The Yuhu IP would be good as well, although there are others.
https://www.ultracast.ca/product-p/ult48016.htm
Other than that, I'd look at some drop-in (ish) replacements as you see fit - exhausts, wheels, gun barrels can all be changed - there're company's like Eduard, Quickboost that can supply those. You might also want to wire the radio tray behind the pilots seat if you want to add a bit more detail.
As I said before, post the build up here - it's be great to see how you get on!
Cheers!
