Digital BW, The Print

Hi again,

So my next step in my printing saga has arrived -

I got replacement carts and bulk ink from MIS today. I'm going to try
out the carts first to make sure I can get good prints from them. Once
I've done that, the next step is to load up my CIS with the new VM ink
I got today (as opposed to the potentially defective VM inks that are
currently loaded in it.) 

So, can anyone tell me the best way to get the old ink out and the new
ink in? I know that the _real_ best way is to buy a new CIS, but I
really don't feel like doing that (considering I'm replacing VM ink
with more VM ink, and considering I've only had this CIS about a month
:/ ) I'm thinking I could run billions of purge patterns - any other
options?

Thanks :)