There is minor discomfort during the procedure but a local anesthetic will be applied to the area where you will be treated to minimize the amount of pain. Please contact a qualified provider or a board-certified physician with extensive experience in these procedures.
Nothing is going to fix your jawline/neck problem other than a lower face/neck lift which is easy to undergo and done safely under local with a little iv sedation for complete comfort. You would look amazing and so natural looking
Tread lift of the tip is very poor solution in particular with underlying scleroderma. A skillful use of filler is much better solution. You should talk to a board certified plastic surgeon with expertise in rhinoplasty about it. Good luck.