I have a 1994 Hunter 40.5 and recently moved the boat from Chesapeake Bay to New Bern, NC for the winter. In the past, I have paid to have the boat winterized, but would like to do it myself this year (next week).The boat has a/c, two heads, four water tanks, and of course the heat exchanger. I am most concerned about getting the anti-freeze into the heat exchanger. I would gladly accept advice from those of you that routinely maintain your own boats.Thank you in advance.