Will I be able to update my website myself?

Absolutely! Designing everything on Drupal allows this to be idiot proof. No offense to you. If you can post a status update on Facebook, an ad on Craigslist, so sell your junk on eBay, consider yourself already trained out!

On another note, we do offer partial and full content maintenance options as well for those clients who prefer to just tell us what you want done.