2-10nl play very similarly. players are all still 0 level thinkers, they just tighten up a bit it seems. not a drastic change, but enough so that u dont have 10 players every hand. If you are scared of moving up, why do 3 tables? why not just move up and play a single table, get comfortable, 2 tables, comfy, 4 tables or something similar? that way you can get a better feel for the differences between the levels.