As far as I know, you just need to be on 6.5x - so you should be fine.

As usual backup all databases etc.

I would advise upon making a copy of your current database, and running a test import on that.

7.1 will be out fairly soon - with 7.1b5 due out maybe today to the members area - you might want to go straight to that instead of 7.0.2 as you are not a stranger to beta's - but of course it is a beta (but maybe closer to 6.5.x than 7.0.2 is)