IM Progesterone Injections

Hi everyone,

My wife is starting on IM progesterone (in oil) tommorrow. The nurses at the fertility clinic have said it's a difficult and painful injection and I'm wondering if anyone has any pointers on how to minimize the discomfort before and/or after the injection. I'm usually quite good with my injections but I want to make this as easy on my wife as possible. Thanks in advance for any help or advice!

(posted in OB-GYN, then figured it would get more looks in the general forum)