Not wishing to hijack this, but my recent thread on installing a peat substrate (29g tank set-up from scratch) shows just how easy it is to do this.
The tannins leach into the water even from under pool filter sand, giving a planted tank that wonderful 'bogwood yellow' water and, of course lowering pH - mine has gone from 8.4 to 7.2 due to using a peat substrate.
The only messy part is when you saturate it by squeezing water into it - you can do this in a bucket, but you don't need much water - if you use too much water the peat will be hard to hold and squeeze - I use about a pint of water, maybe 2, for a half bag of peat. (You can even saturate it in the bag of peat itself, just snip a corner, add water and give it a really good shake for about 30 seconds). All you are looking for is to have no floating peat, and although dry peat is floaty stuff, wet peat is instantly NOT floaty. For a 29g tank with 1-inch depth of wet peat, this took me 5 minutes - literally. Peat is not like mud, it washes off instantly, so it really only LOOKS messy. Because it is immediately waterlogged, even if there is a 'hole' in your sand, like when you start planting, the peat does not float up.
Here's the thread link with photos of installing peat into a new tank:
http://www.aquariacentral.com/forums/showthread.php?t=150805