Congrats on your first half-commute! It will get easier!
Originally Posted by
sumorez
Bike seat seems like the right height to me, I spent a while adjusting it to where I think it should be, but I've never had it professionally set up or anything. That's likely a good idea too.
A good rule of thumb is that your legs should straighten completely with no rocking of the hips when you ride with your heels on the pedals. When riding with the balls of your feet on the pedals, there will then be a slight bend at the bottom of the stroke.

Many people new to cycling set their saddles too low, and this can cause knee problems.