i had an impossible time doing this when i worked full time… its not easy but its not impossible to make time for it. just leave a few hours to work on your own stuff and just force yourself.
my best advise for this though is to only work on what moves you.. you will have an easier time making time for what you are currently excited about.. even if that means doing little simple stuff or working on something for only a day or 2 and moving on to other things, once you get the juices going you can usualy ride the wave for a while.