MagFed is hard. There is nothing about it that is easier. The first thing you learn is that mags won't feed junk and there is an awful lot of junk paintballs in the world. That goes double if you are playing at a "field paint only" field. Mags require that you are shooting a ball that is round and somewhere close to the industry standard of .6875. Mags won't feed eggs, they won't feed over sized paint, and they chop undersized paint.
You can't leave paintballs in the mags for any extended amount of time. That goes double in hot weather. Paintballs absorb moisture and swell up. Drop one in your toilet one day, then come back in a hour. It will teach you a lot.
Trying to play with 20 rounds in your gun against people who have 400 round Pinokio loaders on theirs is hard. Shooting more paint than the other guy has been proven over and over to be the most effective method of eliminating opponents in paintball. You will be at a severe dis-advantage playing MagFed.
If you are ever lucky enough to play at a MagFed event though....you'll get to play some of the best paintball there is to play. There is something inherently fun about playing in a game where I have 20 rounds in the gun and you have 20 rounds in yours. You will find that most people who play MagFed grew tired of blowing through 2 cases of paint a day a long time ago, have no aspirations about ever being a professional player, and are generally there just to have fun. The hard part is (and remember, everything is harder in MagFed) finding enough mag players to have a MagFed only event. MagFed is still relatively new. There aren't that many players out there...yet.
And we don't call it MilSim. MilSim got hijacked by every Tom, Dick, and Harry that wanted to get on the band wagon starting back in 2005. Geez, Youngblood is making camouflage and Jacko is putting rails on Ethas. The whole paintball world has gone whack.
p.s. Get a MILSIG