Biggest mistake of all time;
Thinking that the knife shop at the mall would be able to properly hone my razor. Let me tell you a little something; when you ask the owner if he knows how to sharpen a razor and he answers, "I've got over 25 years experience sharpening knives, scisors, and tools", you should note that he didn't mention razors, and you should take that to mean "no".
I learned a lot about sharpening razors after I got that one back, and I can do it myself now.
Mistake number 2; Stroping. You really do need to roll that blade over it's spine. Trying to do it the way you saw in the movies will result in a lot of nicks and cuts on the strop. Really.