Facial Fat Grafting or Rhinoplasty First?

If finances are a limiting factor, then rhinoplasty + chin augmentation will make a far more significant impact on your appearance than fat grafting and you will likely derive more satisfaction from those procedures.  When finances allow, you can safely undergo fat grafting at some point in the future.  

It doesn't matter which one you do first or if you do them combined or separate.  Its really up to you and your surgeon.  Some considerations are anesthesia twice vs. once, and total cost if combined vs. separate, recovery separate vs. combined.

The plastic surgeon who does the procedure should tell you if there is any concern of doing the fat injections after tbe chin implant such as infection secondary to the fat injections risking the chin implant becoming infected and needing removal