Hi Marsha,
re:lovenox...there are some really good postings on how to use lovenox if you do a search on this site.
Generally speaking you might do well to ice the area where you are going to inject the Lovenox, make sure there are no droplets on the needle itself and inject perpendicularly into the area. You can pinch up some skin and inject there.
It is not a large needle, but not a pen either, it is a regular syringe, and in my case it was pre-filled.
It doesn't seem to hurt everybody, but it did hurt me, a stinging sensation.
I stayed on Lovenox for about 3 days while they brought my INR up with
Warfarin.
Hope things go well for you wih your shoulder surgery.