How hard can it be to become around a 2000 USCF chess player in about a year or 2 if I am currently at 1200? What preparation and training does it require?

It sounds pretty simple to me. Once you know how the horse moves, the rest is simple

The key is to drink as much as possible.  It really speeds the process along.

I've heard trolling in the forums accelerates getting to 2000

Also, it's good to make the best move possible. Although that might get you closer to 3000 than 2000...

Memorize as many opening lines as possible and you should get there.

I will assume the original question was serious. I made 1200 in about 1.5 years of tournament play, and it took me another 10 years to make 2000. A big part of the reason was I didn't play enough tournaments, but let me share what I would do differently, had I to do it over again:

-I would have focused on UNDERSTANDING the openings I played, rather than merely trying to memorize way more many lines than I'll ever need. I would have paid more attention to complete, annotated games featuring the openings of my choice.

-I would have spent more time developing my attacking skills (I don't mean simply tactics), rather than my endgame technique. It really isn't as important as people make it out to be, up to 2000.

-I would have read maybe 15 books seriously, rather than 200+ books superficially.

-Let me stress again that positional play is way overrated up to Expert level.

-I would have worked on my psychological stability more as a tournament player. THAT is the number one thing that you need to become 2000. Psychological stability lets you take tough losses and not stay away from tournaments for months afterwards.

I hope this helps.

And if only it were as simple as spending a year or two studying, we'd be knee deep in 2000 USCF players.

 We have to settle for being ass deep in A-players.