@karma i'm not sure if it will help, but i found it easiest to start doing things by finding the part i can do without worrying about inertia, and the rest often follows
for example, it doesn't take effort for me to put on music, and if i make that a part of the "routine" for doing something, suddenly instead of being faced with a brick wall of inertia when i wanna do that thing, i'm just faced with the task of putting on music--something i'd probably do anyway!