I hated the thought of needles too, but it was fine. They are pre- loaded and really fine.
The needles are much better than blood clots, you will have been through major surgery.
You will have the injections twice daily in hospital so will be used to the procedure - they also show you how to do it before discharge and in my case that also included showing my partner because he knew I didn't like the thought of it and wanted to help out.
Not saying I ENJOYED it, but it was quick, easy and for my recovery. Luckily you will have a few well padded bits to cushion the effects.