Need Help with Rega Planar 3 setup

I just got a rega planar 3 and am a little confused about the following things. First, it didn't come with a manual. Was it supposed to have done so? Also ... Where are the calibrations for the tracking force? What is the slide guage at the back of the tonearmm, just before and beneath the pivot... Why is the anti-skate control so tough to turn. I am afraid of turning it and breaking something. There does not seem to be much room for the tonearm above the platter -- the stylus hardly has room to lift off the record. Thanks for your help.