Yes truing is a tedious thing.
Two Stroke Stuffing has a simple, home mechanic, explaination.
I did my crank for a stock-ish engine going into a bike for my 7 year old daughter.
I trust my work for that.
If you are trying to make a race engine, I agree with just buying a built crank.
I forgot to mention, after I measured the space between the lobes, I found a wrench handle that was a press-fit. It kept the gap perfect. I think there was some beginner luck involved for me.