RE: How hard
Tails...tuff question. But, to generalize, you would want to become proficient on a low wing high performance airplane, be it a warbird or other, tail dragger and become proficient in use of rudder. Once you have succeeded with that, you will find a large warbird to be a piece of cake to fly. P-47 most preferred for starts from your list. You will find a large warbird flies better and things happen a little slower as you cruise thru the air. All that extra lift from bigger surfaces, etc. They are not harder to fly, just more money up in the air. I can fly a 110 inch warbird better than I can a .60 size warbirds these days.