Paul, A guy I met, uses 2 grill forks like the kind for outside grills to help set up the sound post and move it which I did on mine, but tape around where it touches the F hole area to avoid scratches, just put a fork in each side of the F holes to guide and stand it up with.
If you put the strings on very loose you can try to stand it up yourself and try to get it in position which is really important, by luither standards he had told me that on all uprights your sound post should not be moved more than 2 either direction from where it was built and rested, tones can change from movement as little as 1/8 of an inch.
My post fell over one day when I changed strings, not enough tension at once caused it to fall, if you have some patience you can do it yourself, he walked me through it over the phone and it worked just fine, just target for the original marks and move it very little at a time so it doesn't fall again, if you got the time then go for it, just be sure after it is standing that you slowly start to tighten your strings to hold it in place. Good luck John
