Refill Toner Cartridge for Laser Printer

I'm not sure there is a refill center in my area. It sounds rather straight forward using the melt and pour method. I suppose my main questions from this answer (and other research) would be how messy (or not messy) is it, and what type of ink do I need to buy?

I guess I'm resisting your warning to not do it myself. I've also visited a few other discussion forums where people seem to use the toner refill kits such as the ones that you sent, and they seem happy with the quality. I think the health issue, however, is a serious and real concern. But what if I just wear a painter's mask and do it in the garage? In terms of vacuuming out the waste, is this a question of health or the quality of the printing? Specifically, would you mind clarifying why I shouldn't do this myself? What am I really jeopardizing (if I wear a painter's mask), as it would save me some money and I think be better from the environment (though recycled cartridges would also be okay.)