Any good method to bleed Hyd Clutch?

Hello, I have a 96 Exp sport 5 speed 100,000 miles. I recently had the clutch, T/O Bearing & slave replaced and the FW surfaced. Also had new tranny fluid put in. Started having a hard time shifting, read some of the articles and began bleeding the clutch. Everytime i bleed it air comes out and begins to shift better. Thought i had all air out and checked it today and more than ever came out. How much can be in there & how do you tell when it's all out? Must have put 2 large cans of BF thru it already. It doesn't seem to be leaking can't see any wet spots and doesn't go down in the reservoir. Must say the clutch stopped chatering in 1st gear when I take off and now only 2nd & 4th hard to get into. Can the master cyl. be going bad & how do you tell. ANy help would be appreciated.