Heya Norman, guy knitters are so cool!!!
I had a problem with tension at the start as well, my problem was I was pulling the yarn too tightly before I slipped the stich off the needle. I eventually learned to relax my hands and hold the yarn more loosely while I knitted.
Casting on can be tricky and sometimes I would have to re-cast my work if I've done it too tightly. Hildegard's tip does work!!
Anyway, practice does make perfect so keep on trying!