Yes, it's uncomfortable trying a new habit.
The reason to be motivated to replace your habits is probably because if you don't, you'll hate yourself for it. But that's liable to trigger feelings of fear rather than of positivity.
It all depends who you are and what you like. What makes you tick. For me, reading through DaVinci's notebook has a way of driving me to be productive in my own life.
Most of the self-help material is unfortunately useless, probably because what works for other people usually wont' work for you.
The best advice is probably to try a bunch of different things and see what works. If you keep trying different things, statistically you will find something that works, because it's very unlikely that nothing will work for you.