I am on the exact same shots, fragmin in a dalteparin solution, pre-loaded needles.
I've been doing them for a month now, well actually, I have been having hubby do them for a month now. I tried to do my first one in front of a nurse at the hospital, and she never gave me any directions, the next thing I know, I am almost passing out.
So hubby has been doing it, and they have been hurting like a bugger! I am covered in bruises all over my belly.
I have received some tips in the past couple of days though from hubby's sister who has been on insulin injections for 25 years, as well as from my brother, a paramedic and his wife, a nurse.
First of all, it hurts less to go in at a 45 degree angle. Hubby was jabbing them right in at a 90 degree angle, and it killed! I go at 45 degrees and have had less pain and bruising. Don't be scared if some blood pools up (I was the first time I saw it). That just means you hit a small blood vessel. That is when it hurts the worse, when you hit a blood vessel. No way to avoid it unfortunately. My husband used to inject the stuff really really slowly which seemed to make it worse. I have been doing my needles for the past 3 days, and I just do it at a constant speed. Not too slow and not too fast. That seems to work for me.
I think its just a matter of finding what works for you. I'm not sure if your needle is a safety needle that retracts after finishing, but if they don't, the other tip is to leave the needle in the skin for 20 seconds after injecting. For some reason this helps with the pain. I can't do it with these injections because they are spring loaded safety needles.