The cam stack can be lubed without removing it. Put some grease ( I like Tri-Flow ) in a curved tip syringe and you can lube the cam drive gear from the front. It's right under the stitch width red lever.
There are several places to oil it as well Right down the middle takes care of the axle. Threre is also a hole that if you position it to the left and drop some oil ( Oh, did I say I like Tri - Flow
) through the hole it will get under to the flapper pivot shaft.
As far as timing it goes, just put it back in the way you took it out. There is an index mark on the cam shaft and you can make your own on other parts so things go back they way the came out.
Joe