I have only applied it with a PC and a finishing pad, but I can tell you that it's very, very easy and quick, so I doubt I'll try applying it by hand unless my PC breaks or something.
The way I apply it is to use a plastic knife and scrape some out of the tin. You don't want to take a big scoop, but repeated gentle scrapes across the top, like if you're trying to scrape the burn part off a piece of toast or something. This will leave you with just a little bit of product on the knife that's softened up some. Then I spread this on the finishing pad like butter. A little goes a long way, so don't apply too much to the pad at a time. With the PC at 4 or so, spread it around, and continue to work it in a little bit. This will help ensure that you have a thin layer and that it will be easy to buff off.
Remember, a little goes a long way. The first time I did this, after I was done, you could barely tell that I'd used any when looking at the tin.
Hope this helps some.
John