Build a two week stash?

I am desperate to get a tattoo I loved getting them before I was pregnant and it’s been almost a year but I’m breast feeding, we are switching to bottles of pumped breast milk in the next few weeks (we’ve already introduced it he gets one a day right now) but I need to feel like myself again so for my birthday my partner is paying for me to get a tattoo so I will need to have a two week stash of milk in the freezer for this time what’s the best way to pump that stash in advance? My LB is 6 weeks old right now how do I pump enough and still have enough for him? Any tips?