Multiple passes is the key.
I use Mitchell's as well. Great Soap.
I soak my brush in hot water, shake it out and rub it on the top of the puck for about 10 seconds to load the brush. I face lather, so I just rub the soapy brush on my face.
Then shave going with the grain.
Splash hot water, later, shave across the grain.
After you get the hang of it, do a third pass going against the grain. I can only go against the grain on part of my face, otherwise I get ingrown hairs.
Good luck, take it slow and get an styptic pencil. First week might be rough. Don't use the Feather or Kai first. They are sharper. I think I used Derby first. I only use Feather now. I think the Merkur were really bad. I get about 4-5 days with a blade. I try to push it for 6 (full week, I don't shave on Sat), but I can tell.
This is the pelican of shaving,
Badger & Blade - Home
Here is a guy with a bunch of videos,
Shave Tutor - YouTube