How to make sure membership plugin doesn't restrict access until I get it set up?

Ok, I've set up Membership once before, but it's been awhile. I had installed it about a month ago and I must have clicked on the enable link to cause this, but I just want to make sure before I start setting it up so that our current visitors are not upset about not being able to reach our content. So if I Understand correctly, to make sure visitors can still access content, I can activate the plugin and make sure NOT to click the enable link until everything is set up properly. Right?
Thanks!