I do wordpress consulting and troubleshooting and I request an administrator login so that I can step through everything much more quicly and effectively. If you have any doubts, make sure you have a complete backup of your site, database, etc. And create an admin account just for the session. After the session blow the new admin login away.

It is a little restrictive having to have someone else control the session when you are the expert. Ultimately, you have to decide what is right for your situation, however if you're using plugins whose author's you don't trust, you may have to look at the types of plugins you're installing.