How risky is Revision Rhinoplasty?

One of the biggest risks in Rhinoplasty is not achieving the outcome you desire.   Revision Rhinoplasty is inherently more complicated for a variety of reasons and the outcomes become somewhat less predictable.  The best advice I can give is that you need to see a Surgeon who is skilled and experienced in Rhinoplasty revisions.  Since this would be your third Rhinoplasty, I would treat it as the last procedure you should have on your nose.

 A revision rhinoplasty performed by an in-experienced rhinoplasty surgeon can be very risky. Since revision rhinoplasty is one of the hardest operations to perform correctly in the entire field of cosmetic surgery, and this will be your third nasal surgery,  choose the most experienced rhinoplasty surgery you can find in your area who has  dedicated a significant component of the practice to rhinoplasty and revision rhinoplasty

Risk depends on what was done during, previous surgery, what kind of revision is being planned, available blood supply, availability of septal cartilage, if needed, and finally the skill of the surgeon. Risks are mostly related to aesthetic issues, infection,, loss of grafts, etc,