Fat transfer to hips only, what is the recovery like?

Pressure on fat grafts is best avoided for at least a month and maybe two.  If the fat is grafted laterally on your hips, then either supine or prone positioning postop should be fine. 

While fat transfer can reshape the hips, most patients generally require their buttocks to be improved as well to achieve a smoother result.  For this reason, I typically allot about one-third of the fat volume to the hips, while the remaining goes to the actual backside. 

The fat injection site should not receive excessive pressure for at least three weeks postop.  A good rule of thumb is to sleep on one side leaning more toward your stomach.

Good luck and best wishes.