wow alot of bad advice here with low PP :S
ok, its a myth that if you are in EP you should be limping in.....
unless you are deep stacked its bad play
if your first in the pot you should be the agressor
but in EP you risk being re raised
now if your opponents are exceptionally bad, then they will let you see a cheap flop and nobody will raise, but the more limpers the higer the raise will be, the higher the raise the less of a factor implied odds
Also from EP your out of position, so how do you play it?
do you get agressive if you hit a set, or slow play it?
if you slow play it what if it doesnt get raised?
how much are you going to get from your set realistically in an unopened pot?
so from EP your not looking to get involved
however when in late position, you have more info + opponents are more likely to raise before it gets to you from LP as a result you have implied odds, you can also see exactly how big the pot is before making your decision, and you have more options of "re raising, or flat call set mining"
depending on what your hoping to accomplish