The video dbmg posted is the way to do it; still need to support the trans though. Removing the primary has quirks of its own and a good idea to replace IPB seal in the process, replace o-ring at the housing cover at the compensator, sealing the locking tabs at the inner primary bolts, wrapping the main shaft splines with painter's tap to protect against nicking the IPB seal, etc. Get the HD service manual for the bike as has been suggested; step by step instructions and all torque values are there. There are some "special" tools or work arounds required for this job. Not rocket science but it will require service manual, man hours and the right tools for success. The end game is replacing the drive belt but there are several things to pay attention to getting in and out.