I second Owl64's advice.
I also advise to get as good hotkey software as possible and to watch my favourite Pokerstrategy video of all time: 'How To 30-Table: A Guide to Mass Multi-Tabling' by the SnG legend Collin Moshman (featuring a live laptop 40-tabling session by his wife Katie Dozier
). You don't have to end up playing at a zillion of tables, but his tips are helpful every time when you try to increase your table count.
If you don't want to get the Silver status needed to watch it (which is way cheaper to do by playing 9 days a month at a partner room, raking $2-3 to earn 10 base SPs + 90 bonus, than by purchasing directly), you can purchase that video at the shop for $3.99 and store it forever. It's well worth the money.
Originally posted by Harrier88
I agree with what k0kki3 said, there is absolutely no reason to force yourself to play more tables. Your winrate is what really matters, so just stay at two tables if your winrate is higher that way.
The hourly winrate is what matters, and in most cases it increases at least slightly when more tables are played, even if we take into account that tighter bankroll management has to be used then because of a lower ROI or bb/100 winrate.
Don't be afraid of mistakes, everyone makes them. That you play suboptimally in some rare spots (always fix your leaks in frequent spots first) is more than offset by the fact that you take a bigger share of the deposits of the recreational player base as a whole due to increasing your presence in the pool as opposed to the other regulars.
Moreover, the fact that regulars generate more games by playing more tables entices more deposits from recreationals because the latter get a game running faster and also lose money at a not-so-ridiculously-high rate, which increases their pleasure and willingness to reload. Hence the poker economy gets bigger and more profitable for the reg pool as a whole than if every reg was bumhunting at few tables.