Multi-tabling is fine, if you can do it. If you want practice, get in as many .11 bumblebees as you can til you can't handle it. when you find the right amount of tables for that, that is your limit. i'd suggest not playing at your limit all the time, but playing a table or two less would be ok. and as you get used to that amount, break out the .11's again and see how many you can do again, adjust and repeat