I've found that in order to become comfortable doing something routinely I need to find my reason for wanting to do it. Forget about the usual reasons people do these things and find your own. I have found that trying to trick myself or bargain with myself really doesn't work.

The simplest example is wanting to do something not because it needs done, but because I know doing the stuff I like will feel better with everything else taken care of beforehand e.g. sitting down to play games on the PC feels great, but it feels even better knowing I've done the dishes etc.

I've also found that it takes me a long time to introduce something into my routine but once it's there it's pretty rock solid. So I try not to put pressure on myself. If it takes months to adjust my routine for one thing then so be it.