Ive made too many mistakes since setting out.. I guess the main one being the fact that seeing as though im now in my ~13th or 14th year of being, in some respects a "domainer" per se, I probably wouldnt be making this post if I hadnt made this whopper of an err/omission/ sleeping on the job mistake..
Does that make sense..? lmao..
If I can however offer some candid advice to anyone setting out:
1. Dont set out with the intent of finding an angle or garnering the system - they have all been found, have are all gone and you'll be hung out to dry if you try, what you think, is your blackhat eureka moment.
2. Research, research and research before buying.. Check things like seeing if your killer .net or ccTLD is available or cheaper in .com.. Check Google external keyword tool for monthly searches on that term etc.. If it's a phrase, how many google results are there for it in an "exact" match.
3. Don't get sucked in too deep on new extension releases.
4. Try and have a solid idea of what you intend to do with your domain before you buy it ..
Aside from that; treat domaining like a hobby, enjoy the experience, dont let it take over your life, limit how much time you spend doing it and dont, for a single minute, think that you will be able to give up your job and do it full time.