Well I won't be giving any advice on switchbacks.

As far as quick release seat clamps go they are fairly cheap & very easy to install yourself. Just make sure you get the correct size (depends on your bike but it's to fit the seat tube so won't be the same size as your seatpost).
Basically you remove the seatpost, take the old clamp off and slide the new qr one on. That's about as hard as it gets.
My bike came with a bolt on clamp & I purchased a qr one, but as I haven't needed to adjust the seat much for my rides I've put the bolt on one back on, still have the qr sitting there as a spare in case I want to pur it back on again. It cost me about $15 Australian.

Of course if you go get a Salsa one or something it will cost alot more!