How to hold handstands?

How do you learn to balance a handstand?. I can do a nice handstand but I am trying to hold it and I can never hold it for more than about 5 seconds. I do them against walls for strength practice and I can hold one with the wall for about 2 minutes. I...

also want to try to walk on my hands. Any advice? Thanks!

well first off it takes lots and lots of practice, so the more you practice the better you should get.
also it has a lot to do with your feet positioning while in the air.
so find ways to move your feet while up there that help you stay up more.
because the feet positioning plays a big part in balancing