halo reach, how to get a perfection

in halo reach there is many medals you can get. One of which is the perfection, if you are not familiar with this medal than let me tell you about it. Basically its were you go a whole game with out dying and getting at least 15     kills, it looks like this: kills, it looks like this:                                                   

so now you know what it is and what you have to do to get it way don't I give you some hints, tips and strategy's on how to get it:

OK so the best way to get a perfection medal is on a big map with a lot of people on it, take a D.M.R and go to town, make sure to keep your distance and back off when you need to, and unless you are really good at driving a vehicles avoid getting in them and driving them, also make sure that most of your weapons are long range, so you don't have to get close to any of the enemies. Once you get your 15th kill,  (you will know you got your 15th kill because it will say running riot) unless you are really confident I would go and find a hidding spot until the game ends.  There you go that was my guide on how to get the perfection medal