I'm not a developer so I previously paid a web-designer friend to set up my WP site. But it was a pain having to go back to him every time I wanted to change something. I searched high and low for a theme that would be fairly easy for an inexperienced person to install, and have some degree of customisation going forward. Oh, and lots of lovely functionality and slider options. Nothing else like that exists out there, unless you pay through the nose for one of paid themes. Then I found Customizr and I couldn't believe my luck. It does EVERYTHING I needed it to do, has fantastic customisable functionality (as you'd expect, given its name) and has given me a cleaner, whizzier, more professional looking WP site than the one my web-design friend started me off on. Most of the functionality is intuitive to use, and it's really forgiving of my novice skills. They even made it a cinch to set up a child theme, so I can further customize what comes out the box. And if you don't know what a child theme is, neither did I till I installed customizr and found out how easy it was to do.
There's full theme documentation to get you started here: http://www.themesandco.com/customizr/
And Nico (the theme author) blogs about the latest releases, unpdates and additions here: http://www.themesandco.com/blog/
No, I'm not on any payroll, I'm just a user and a fan. Had the site up and running for a couple of months now and it's not let me down.
If you need your hand holding even more, I found a couple of useful videos on Youtube which I found really valuable when taking my first steps.
[ links redacted, please do not post those in reviews. Links to the theme author's site is fine. ]
Finally, the icing on the cake for me is the Customizr's author Nico, and his back up team of support Members on the forum (esp d4z and rdell), who are so incredibly helpful in replying quickly, solving issues, answering questions and giving fantastic advice.
These guys really are the deal, and this theme really is the deal. Can't recommend it highly enough to anyone who wants an intuitive, easy to use, highly functional, great looking WP theme that doesn't cost you a thing. Although I went on Nico's blog and donated a few bucks to keep him and the guys in coffee. Worth every cent.