Had Rhinoplasty 8 Days Ago, Picked my Nose, Pulled Some Stitches. Would This Affect Final Result?

It is common to have dried blood in the nostrils following rhinoplasty. In most cases there are incisions placed just inside the nose for rhinoplasty and sutures to close these. Blood can tend to dry in this area. If you removed some of this dry blood and accidentally removed a suture a week after surgery, it is unlikely that you damaged anything deep such as the cartilage. The skin incisions heal very quickly after rhinoplasty. If you had a lot of bleeding after the dried blood was removed, you may have opened the incision slightly - this should heal without a problem. If you are concerned, you should contact your surgeon and describe what happened to get the appropriate guidance.

If you are very worried, your surgeon definitely wants to know about it.  I would touch base with him/her and let her take a look.