table 'users' already exists

I'm writing an application and decided late in the game that I needed
authentication, so after viewing Ryan's railscast, I downloaded the
plugin:
script/plugin source http://svn.techno-weenie.net/projects/plugins/
script/plugin install restful_authentication
script/generate authenticated user session
rake db:migrate

I'm getting the error: rake aborted!
Mysql::Error: Table 'users' already exists: CREATE TABLE users ('id'
int(11) DEFAULT NULL auto_increment PRIMARY KEY) ENGINE=InnoDB

What's the best way to fix this. Will it work to just migrate back to
version=0 and delete the migration files having to do with a users
table I tried to create on my own in the beginning? or will that just
blow everything up?