Your 2008 setup is totally fine for this. The water side is the easy part - you just need a plumber to install a T-valve on your existing toilet supply line, takes maybe an hour and costs next to nothing. The real question is the outlet. If you don't have one nearby already, you're looking at running new electrical, which means either hiring someone or getting into your walls yourself if you're comfortable with that. That's where most people hit a snag.
I had this exact situation at home a couple years back. My bathroom had zero outlets near the toilet, just one across the room by the sink. I ended up calling someone to run a dedicated line, and it wasn't catastrophic but it did eat into the budget. Once that was sorted though, the bidet seat install itself was straightforward - swapped out the old toilet seat, hooked up the water line, plugged it in, done. If your house already has an outlet within a few feet of the toilet, you're golden and can knock this out in an afternoon. Just check that first before committing to anything.