ben&dionsmummy,
It takes a little time to get used to doing the injections yourself. After a week or two you get into a routine and figure out some tricks to make it easier. I started mine again two days ago too!
I always try to inject at a slight angle with the needle sharp point down, inject slowly, put pressure on the injection site for a minute or two after, I use band-aid spots on the site because mine tend to bleed on and off during the day, space out your injection spots or they will bruise badly. you will get the hang of it. It really isn't that bad. You wont want to have your doctor do them for you forever.
I took clexane during my last pregnancy only because my doctors didn't know what else to do for me. I did not test positive for any clotting disorders (and I have been tested for everything possible).