Do it, hurry and do it.
Alrighty, here's the skinny. Remove the bottom metal with an appropriate allen wrench. Carefully remove the barrel and action from the stock, hate to ding that $250 finish.
Now it gets tough, you need to remove the sealer from the small adjustment screws. Through trial and error I scraped with a pocket knife, then heated with a lighter, poked at the allen screw hole with a jewelers screwdriver, wallered around with an extreamely fine allen wrench then finally got the proper 1/16 allen key into the socket. Not really that hard, just a very fine hole you are trying to access. By the way, the one you want is furthest from the action and therefore easiest to reach. I believe the heat did the most good, the sealer was much like hot glue.
I backed the screw out 1 1/2 turns roughly. I don't have a scale, but it is sweet
. I'm tempted to open the Tikka now and see what sort of goodness awaits in that trigger. I put a spot of nail polish over the screw and buttoned it back up.
The owners manual advises that the screw will fall out at a three # trigger pull and can't be reduced beyond that.