Hello DB – I completely understand your concern about wobbling. One of the reasons I learned to knit in the round was to avoid this very thing, no seaming, no wobbling. I have used a miner’s lamp (headlamp) to be able to see my yarn better, also, I use reading glasses and will double them up to get the magnification that I need. It is important to be able to see your yarn clearly while you are seaming.
Have you thought about using some swatches to practice? You could try out the back stitch, and the mattress stitch. After a bit of practice you will find out which technique works better for you and you will have the confidence to move forward with your project.