How it works
Typing is like rowing: every key you press is one pull of the oar.
Uneven taps stop and start, some close together and some far apart. Even taps leave the same gap every time, and that is a steady rhythm.
Pick a slow beat, and give easy keys and tricky keys the same beat. Hum a tune or count in your head, and your fingers follow the beat.
When a tricky part comes, do not rush the easy keys and then freeze. Slow the whole beat down, so every tap stays even, and if a key is off press backspace once and carry on.