Ben, Can I add to Keith and David's useful advice just one point. It is a rewarding experience to check to progress of your mashing (liquefaction and saccharification) by testing for starch content. This is really easy: just take a small sample (a gramme or so) and dissolve in a clear plastic photo film canister half-filled with tap water. Then drop in one drop of "tincture of iodine" (from chemists shop sold as antiseptic). If it turns black or dark blue, there is plenty of unconverted starch left in the mash. If it remains clear or pale brown, the starch has all been converted. It will not tell whether the products are long or short chain sugars. You should be able to get 100% conversion if enzymes are active.
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