I used to wind my tables as far back as I would to get some space. They should be coplanar to the block already Then you set the blades to the block, and wind the tables back. They should still be coplanar to the block and therefore the blades.
Ignore the infeed table, just wind it as far down as it will go so you can get your spanner in more easily. You set the blades a tad higher than the outfeed table, registering off the outfeed table to do so.
Edit: This is poor resolution, but you might find it useful:
I've set mine up a while ago (put a plane on the outfeed table and attached a strong magnet to its side - the magnet was strong enough to hold the blades up) but can do with new, sharp blades, so will need to re-set.