M&J has always been a wonderful trimmings and button store on 6th Avenue in New York City (at least as long as I have been here, which is quite a while). Recently, they’ve gone into helping out with jewelry making, via their blog, and also kits they offer which carry all the materials to make projects from their given tutorials.
Fitting, then, for them to give us a nice blog post on how to avoid DIY disasters. I found it a good read, with good advice. Please check it out. (While you are there, you can check out other blog posts and ideas.