MB does a nice job explaining it all;
http://mac-baren.com/how-to-fill-a-pipe
You could also cube-cut the flake to start in between practicing the
fold/stuff methods....it does take time, but once you get down...wow
what a smoke you will have ;-)
Note; Yo have to experiment on which style works best
for you; blends, pipes, etc...for example I find that with
MB's ODF I like a cube-cut VS Fold/Stuff method which
gives me the smoke/flavors I desire. Now with Peterson's
Irish and UF, I like the fold/stuff method in Stanwell's 63M
style pipes because they have a nice coned-shaped bowl
which works great for the fold/stuff