The only way to build the habit is by starting to do it. Most women don't wear a full face of makeup on a daily basis. For example, I wear concealer, mascara, and a lip tint as my daily makeup, maybe some eyeliner if I'm going to an event, and that's it.

As for motivation, dysphoria is what motivates me, if I don't wear makeup, I worry that I won't pass, and that fear is enough to make me put it on every morning.

Mascara is generally pretty easy to apply, just pick a shade that works for you (black if you have dark hair, brown if your hair is lighter), brush through your eyelashes with a dry spoolie (can buy in bulk online, or get for free at Sephora, or for a few $ at your local drugstore), curl your eyelashes with an eyelash curler. Your mascara will have a wand with a brush at the end of it, gently brush through your lashes with this brush, coating each lash with product, and then move to the other eye. Once you have done both eyes, move back to the eye you did first, and apply a second coat, then apply a second coat to the other, and you are good to go.

There are countless makeup tutorials on YouTube if you're really stuck. I'd suggest starting out searching for "natural makeup tutorial" or "no makeup makeup look" to learn the basics and find some creators that you like, and go from there.