I am looking to switch hosts, and the plan I am looking at only includes 1 database. Currently I have several. So I know I can do that using the table prefixes, but what I am wondering is how to transition everything over. Can I alter the table prefixes now by just changing them or will that screw something up, and is that even possible in phpmyadmin? If not, then how can I get my 2 separate blogs into one database without them getting mixed up?