Are they harder to ride than a regular bike?
No, they take pretty much the same or slightly less effort to pedal than an upright bike. Recumbent riding uses the same muscles as a regular bike, but it uses them in different proportions – generally, your quadriceps (the muscles running along the top of your thighs) do a bit more work than on an upright bike, but after a month of regular riding you’ll be acclimatised to this and you’ll be putting the same effort in as you’ve always been. The difference is that you’ll be a lot more comfortable in the process.