Ladies Bikes - What are you riding?

You got a good modern geared bicycles, if you do want to have some project, the best way is to simply find an old bicycle and convert that to a singlespeed.

it's also a good way to not worry about whether you're messing up your current modern bike.

Yeah, having thought about what you (and others) have said, it'd be a bit mental to use a pretty good bike as My First Project!