Here's some tips that have helped me along the way:
Long standing arguments about whether to glue pillars in first, then bed over them -or- attach pillars to action and bed at one time.
My way is to attach the pillars to the action. This way the entire assembly is static and I have zero risk of anything binding when I go about it. If it binds, I won't even be able to put it in the stock. I have to ensure it's completely inert before hand.
First step in attaching the pillars. Get some 100 grit and wrap it tightly around your receiver. Rubber bands/tape helps. Now, lap your pillars till they match the contour. It's not easy, takes practice. If you have a mill, bore the arc first, then finish lap. Much easier this way.
Now, attach your pillars and screws. Ensure the whole barreled action will flop right into the stock's inlet. Use tape to support the barrel in the front and just ahead of the recoil lug. Adjust the windings till it sits perfectly level and at the correct depth. Remember, a 1.35" OD action has a radius of .675".
So, "half in, half out" is what your striving for. If you go too deep, the bedding will creep over center and you'll have a devil of a time getting the action in/out of the stock. Too high and your trigger is in the wrong spot, magazine dbm setups don't work right, and your grip/stockwell will feel wierd.
Half in/out. ensure its right before proceding.
Parallelism. Long standing arguments on this too. For a traditional rifle used in the field. Laser straight with the showline is what you want. If your building a bag/bench type rifle there's a compelling argument to put a 1.5 to 2 degree rise on the barreled action. Has to do with bag tracking.
Schmag up your stuff with your chosen resin and squash it in there. Keep the gun horozontal and level as it cures. Check it for about the first hour or two periodically. Little bubbles can appear on the showline edges. You can easily patch these by whipping up some more resin and squashing it in the little hole. Use the misses hair dryer and that stuff will draw right down into it. Save a lot of headaches later.
Hope this helps.
C.