In fact, I have managed to catch some Pokemon but it wasn't as easy as I was expecting.
Catching Pokemon is fun, especially when they don't break free. It is finding them that is the hard work.
After you install it, you start it and set up your avatar (your player). Then you start walking about looking for Pokemon. Lol. Actually, after launching the game and setting up your avatar, your first Pokemon will come to you. Then you'll catch it by tapping on it, tapping and flipping a Pokemon ball at it. If you are lucky it won't break free and you'll get points.
You should try the game, though I find it somewhat addictive. It locked down about 45 mins of my time yesterday as I was hunting for Pokemons and I even almost left for VI to catch the two it showed me were at Muri Okunola Park and Civic Center.