XF 1.2 Final import

I have a test forum set up right now. Went from vb 3.8.7 to xf 1.2.5. I have my style just as I'd like and have done a test import already. I am now ready for the final import and to make xf my love forum.

A couple questions:

1) should I drop all the tables as mentioned in importing guidelines and then import or should I start from scratch with a new database like I just installed xf.

2) if you recommend dropping all tables how do I do that? It's not mentioned in the instructions.