I just got the Eezi bleed from IPDUSA (22 dollars).

I have read the FAQ and some archives on pressure bleedinga nd flushing. I still have a few questions :

1) Pressure
It says in the instructions to bleed at 20 psi. If I use my spare wheel to bleed, how do I check that it is at 20 psi? Use a gage and check tire pressure for the spare? I have read some posts that recommand 25 psi (instead of the 20) otherwise you have to pump the pedal for the rear.

2)Reservoir
Should I remove the reservoir and clean it before doing the flush? My junk yard connection tells me that the seal may leak after I remove the reservoir. Should I buy the 2 seals at the dealership before bleeding/flushing and still remove the reservoir?

3) Reservoir (still)
I have read to empty it with a turkey blaster before starting the flush/bleed job in a post. The instructions say to pressure flush the old fluid with an empty bottle so that you don't mix old and new fluid.
Should I empty completely the system from brake fluid and put fresh fluid in? Or only empty reservoir and push out old fluid with new fluid in the bottle?

4) Any tips with regards to the use of Eezi bleed or in general to pressure flushing/bleeding? SHould pedal be pumped at all for instance during in between each wheel?

Thanks in advance for the help.
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'89 244DL M47 159K miles