as its labour only you should expect about 2 hours labour costs most garages charge anything from £35 up to £65 an hour roughly for the forks,and your rear wheel alignment is something you have to learn to do yourself as other op said if you look down where the rear wheel spindle goes through the frame you should see lines on the frame and a mark on the plate the spindle goes through counting from the front both sides should be on the same mark,and if your chain is to tight then you need to loosen the main spindle slightly and the adjuster bolts in the rear of the plates then move wheel forward slightly untill you get the correct amount of free play then tighen everything up again,of course if you are not sure ask the garage to do it and also ask if you can watch so you know how to adjust it in future when doing your routine maintaince