I was thinking about lightening the trigger pull on my S&W .500 and Desert Eagle .50AE to about two pounds. Is this two light? And can your average gunsmith do this?

Too light on the semi auto for sure.

A two lb single action pull o the 500 don't know I personally would want it a bit heavier.

Why is that to light for a semi?

what p dog said to light a trigger on a heavy recoiling pistol can cause repeat firings. i.e. the recoil will jar your finger on the trigger enuf to fire again

so maybe a 3 lb trigger on the eagle and 2 lbs on the smith&wesson?

Don't know about the desert eagle, but can easily be done on the smith and Wesson.