I have a Jard, Inc trigger on my M77.
I bought the 1 pound trigger, as its purely a target/varmint gun. The actual pull weight is 13 ounces.
Installing it is very easy, no gunsmith required. The most you might have to do is sand a bit off the bottom of the safety to make it fit right. Took me maybe 15 minutes to install.
The only caution is to read the instructions thoroughly and look at the trigger carefully as the adjustment screws can be installed backwards and then you can't adjust them.