It's a simple process. You're common handtools should get it done. You will have to open the chaincase, remove the bottom gear and bearing. On the other side, you will need to remove the bearing, which the speedometer cable is hooked to. Make sure you do not lose the key inside the cable (did it once, luckily I found it again). Scope it out a bit and take it piece by piece. It's a relatively simple process.
Once that is out take the speedo drive housing on the clutch side.
Next drain the oil out of your chaincase using the drain plug on the inside of your tunnel. Now take off the cover. Unbolt the top and bottom gears and pull the gears and chain out. unbolt the plate that holds the bearing in place on the cog shaft. once that is off you can now push the cog shaft towards the clutch lide of the sled. the chain case bearing should come off the shaft easily and once the shaft is out of the chain case side you will need to angle the cog shaft to get it out of the other side.
if your planing on replacing the bearings on the shaft you will need to cut or press off the clutch side bearing.
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