I have had very good results with International Toplac paint which I think is universally available. This is a single pack paint which has Teflon and other modifiers in it which gives a finish and durability similar to high grade two pack spray finishes. International Paints, (maybe Interlux in other countries) have a lot of painting guides available to help you with prep. On my boat I did a good sand of the old paint system, two coats of the recommended undercoat surfacer with a light sand between coats, and then two coats of the Toplac rolled on and laid off vertically with a brush. Total cost for my 10m boat of about NZ$300 plus my labour. In New Zealand it is possible to get cheaper boat paint but I think that if you are going to put in all the prep work then you might as well spend what is only a very little bit more money and get a top quality paint which is going to last and look good for a few years.

If you are going to paint your boat this way you need to make the job go as easily as possible and this means a scaffold plank at a good working height all the way around the boat. That way the paint will go on seamlessly. The ideal way to do the topcoat is to have one person rolling on the paint and a second person following behind to lay the paint off. You need to work fairly quickly with the top coat, especially in hot or windy conditions and it is also a good idea to use a brushing retardant in the top coats so you have more working time to lay the paint off nicely. You don't necessarily need to lay the paint off with a brush after rolling but doing this tends to give a better finish. 

For non skid finish on decks we have in New Zealand an acrylic non skid paint for marine and industrial applications. This lasts for years (a decade or more) and I am sure there must be similar products available in other countries.