In terms of application, every wax is different. Some want to be done in the shade, some in the sun, some leave on for ages, some take off straight away.
As a beginner to medium level wax, I find it hard to look past the Dodo Juice range. Hard wax lasts longer than soft wax and is better to put on with a pad, soft wax can look better but needs to be done by using your actual hands really. If you want something really good without going too mad, then the DJ Supernatural is immense for the money: It's what I use on my cars except the 911, which gets the ridiculously expensive Swissvax stuff. DJSN is a piece of cake to work with as well;, put it on how you like and take off how you like, it really doesn't care.