Is the SSL installation going to be a concern?

Hey all,

A client is having an SSL installed on his server through his hosting company, 1&1. I am using a multisite structure, with marketpress and Stripe for an ecommerice site.

All I want to know is if there's anything I need to worry about or do specifically now that there will be an SSL certificate? Or is everything the same and there won't be any problems as long as it's installed correctly?
Sound like a dumb question? Then give me a dumb, basic answer. I'm learning and not embarrassed about it.