I made my first beadroller about 20 years ago.
I still stand behind that you need to practice. Also need to know how to work.
For these better to have motorized model w/food pedal.
Plan first how and in what order.
If doing multible beads or deep ones, pre strech. I use EW or planishing hammer.
Get good tools, practice with them. Get enough free space, a comfortable position, good chair, support table.
One important matter is how to trow your lines, picture to sheet. Some print to sticky paper, I print idea to clear film and shoot it to wall with old school projector. Hang my work piece to wall and trow the lines with marker. I made inner fender to one of my project today:
Cant show you any more yet so dont ask. All in good times.
Its just one way to do it. What works best. Worls is full with better ones than me. But thx anyway.