You asked,, I answered,

You'll have even less of a problem using a Vanessa Rig,, but since you have never tried it you just don't know how much easier and much more accurate it makes the process,

As you can see from my rig, it can be made very inexpensively,, most that stuff I had laying around the garage,, the only thing I went out and bought was the pipe insulation..

good luck