Agreeing with all the above posts, I can only add that beginners to midi can begin fairly easily. I'm not all that technologically proficient, but (once I got sound) I was able to edit midi tracks generated by BIAB into leads/melodies, or tweak the performance in other ways, without a controller--simply by editing the notes/commands in piano roll or a similar midi editing method.

I've known guys who could compose entire pieces and all the parts in midi without a controller--just a mouse.

Somewhere between those two is most likely where you lie. It's like every technology. Once you learn the basics, you can at least do something useful, and your results can be nearly immediately evaluated.

BIAB 2021 Audiophile. Windows 10 64bit. Songwriter, lyricist, composer(?) loving all styles. Some pre-BIAB music from Farfetched Tangmo Band's first CD. https://alonetone.com/tangmo/playlists/close-to-the-ground