You are lucky on a cat because you may be able to actually drop No1 between the hulls and keep on going forward to the spot where you drop the bower. Reverse some, then let the boat settle half way between the two. Make sure it is a line to the chain not the other way round. You do not want to wake up to the sound of chain grinding your plasticky topsides
Less fun in a mono but I do fine by simply rowing No 2 away and then doing the rest of the job from the deck
. Cannot be done with a heavy anchor but ours is a wee boat hence the 2nd anchor can be rowed off most of the time.