How do you add a plugin to you're wordpress blog? or change the wordpress theme? or test some wordpress settings
On you're online blog? Well, I hope nothing goes wrong.
Wordpress is a stable product, I never had any problems with adding plugins, or theme's, but some of these plugins adds tables to the database, changes settings,etc. Adding plugins will pollute you're wordpress blog and can get you into problems.
Anyhow, you should consider first to make a local copy of you're wordpress blog b...