I won't give up..but it's going to wear me out!

I've wanted to play upright for a very long time and fully intend to have a LOT of fun with it. My fingers will get a good chance to toughen up slowly..my wimpy arm is evidently going to insist on short sessions for a while.

Am I going to give myself a horrible habit if I sort of clamp the bass with my forearm/elbow until I feel more secure about letting it lean loosely against me?