I see some major mistakes that beginning cuemakers make as I deal with them on a daily basis.
First mistake is they rush things too fast in order build a cue. My suggestion for someone who wants to build a cue fast is buy some wood with some turns on it that just needs a little taken off to finish and work with that for a while. Old bar butts are great for making butts out of almost instantly. Just thin them down a little and they look like new and have aged plenty long already. Buy some shaft blanks either pre tapered to final sanding size or a couple of MM oversized so you can finish them fast. Buy some other wood and start turning it slowly while you are mastering your joints, butt plates, ring work and finish on the old bar butts, and tips and ferrules on the tapered shaft blanks.
A second mistake I see made is trying to cut too many corners on education and not utilizing what info is out there. I know this sounds like a plug here, but it is the truth. Why re-invent the wheel and waste all those $$ re-inventing it. A $50 DVD or $70 book or both will save you a lot of headaches. Buying the wrong piece of equipment to start with is the most common mistake made. Many buy a $200 to $400 wood lathe and call me wanting to know what it will take to make it a quality cue building or repair lathe. They are usually shocked at what it really costs to make a wood lathe do half as good of a job as a metal or cue lathe. The Book eliminates those costly mistakes.
A third mistake is trying to learn too much before actually building some cues. I have had guys call me and want to know every little detail about how to put their first joint pin in perfectly straight. Then call back six months later to go over it again because they forgot what I told them, and had still not tried anything. I once asked one guy who was notorious for doing this type of thing multiple times, why he is so afraid to make a mistake and that he needs to just go get his hands dirty and build a cue. Just do it and learn from your mistakes. I told him his expectations being so high for his first cue was hindering him from getting any experience. He replied, "Yes, but maybe I will build a very high quality cue also."
I never saw his first cues and he did finally become a cuemaker. But he wanted to have a college level cue building education and have every technique memorized before actually building a cue.
Cue building is not like a normal college course where you can learn it all from books or DVD's. It is more like a trade school education where you get some book learning, along with hands on training at the same time. Without the hands on experience and gaining a feel for things you will never be a quality cuemaker. Feel is something you cannot teach. It must be developed from experience.