Let's say that you want to floss every night. Start by just touching the floss when you brush your teeth. For me, after a few nights I got frustrated and just started flossing. On days I'm tired I still just touch the floss.
Too much? Break it down more:
Look at the floss
Touch the floss
Open the floss
Pull out a little
etc
The idea (I didn't come up with it but forgot the source) is that many of the tasks we are trying to get ourselves aren't that hard but it is overcoming that _mental_ hurdle. So by breaking down into micro-tasks you slowly raise your threshold. You are also trivializing the tasks. It isn't hard to go from "My hand is already on the floss, why don't I pick it up?" and so on. I find that I get frustrated with the micro task within a week and just end up doing the thing. (I've been flossing my teeth 90+% of days for the last 6 months)