The choice between DOP and POP is something you'll have to decide - do yourself a favor and give each a try. POP (Ziatype) has a greater range of colour possibilities but does need careful control of humidity. DOP may 'feel' easier because the chemistry required is pretty basic (ie. no exotic oxalates or metals like Zia) but in the end neither is more difficult than the other. I use to mix from 'scatch' but found there was really no difference in price between buying the 'raw' chemistry and buying the 'mix' from B&S. Which ever process you decide to try first I'm sure you'll have a great time!