NTO, you are right to be concerned about dislocation. However, provided you don't push the joint past being comfortable ( 90 deg, if I remember correctly) and keep up the exercises your muscles will get stronger. Depending on how active you are, you will start to forget about your hip surprisingly quickly.
I tried to walk about a mile a day, even with my crutches. My hip was not glued and I had to stay on crutches for 6 weeks.
I now have more movement in my replaced hip than the other "good" ? one. and never give a thought to it.
I can manage all my ballet moves equally well as before the op now. OK I admit it - I couldn't do any before the op.