If I can impart a little wisdom as a limit player, the thing that controls variance in no limit as opposed to limit is your ability to force players out of pot. Limit players have very little fold equity, and hence we see a lot of showdowns and that gives players who were behind at the flop a chance to draw out. You guys are able to price the draws to force players to fold (or make bad calls which pay off for you long term).

Playing shortstackers in NL is going to be a lot more like limit in terms of variance-- because they are basically shoving the hands they like and don't have to put much into the pot to be pot committed, you are much more at the mercy of the cards as you can't force them out of hands.

So I'd follow the advice of the other commenters but also be aware that you could have very high variance-- you could be doing everything right and still lose money in the short term.