Both are correct and understandable in that you have a few more things to do before you go out the door.

Using the flexive myself would draw more attention to your person.

I would interpret

getting myself ready

to mean: your hair, your dress, your makeup, things more personal to you

getting ready

could mean getting your keys, turning off the lights, checking the cat's milk supply, but can also mean things about yourself.

In math speak, getting myself ready is a subset of getting ready

In terms of usage, using myself is more AmE, in BrE one would usually not want to draw that kind of attention to oneself.

Both are correct and understandable in that you have a few more things to do before you go out the door.

Using the reflexive myself would draw more attention to your person.

I would interpret

getting myself ready

to mean: your hair, your dress, your makeup, things more personal to you

getting ready

could mean getting your keys, turning off the lights, checking the cat's milk supply, but can also mean things about yourself.

In math speak, getting myself ready is a subset of getting ready

In terms of usage, using myself is more AmE, in BrE one would usually not want to draw that kind of attention to oneself.