Trying to finally get my first Muscle Car - I’m nervous

IMO. With limited mechanical skills and paying someone to do the work that 11k will turn into 30k really quick... get the nicest driving car you can find and enjoy it.
Read this ^^^^^^^^^^ carefully, that's from someone who was in almost the exact same circumstances as you described in your original post. He had little to no mechanical experience when he bought his Dart, but has learned a great deal about the car, not always the easiest way. Read his thread Dartin for Divorce, you will find it very interesting and helpful.