Assuming you have not removed the pulleys, orient the spindle. Then put the belt back on with the spindle drive lugs in the proper position to load a tool. One tooth on the gearbelt is quite a bit of error, so you should be able to guess correctly. At least, that is what I did with mine, because it didn't look too handy to me to get down in there, loosen off the orient ring, then do the orient, and rotate the spindle into position by hand, retighten the orientation ring, which would be what you'd have to do if the lugs were slightly out of position.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)