RE: holdin steady
how old are you? hopefully not a medical problem, but if you;ve noticed a major change......get a checkup, otherwise if you've just shake some.....
I believe being stronger can only help......practicing holding at full draw for longer periods.....ie building up endurance muscles, can only help.
Aside from that I once heard that rather than trying to hold dead on a target....since without a bench that is impossible......try to circle the target......or kinda a controlled wobble, dont try to lock on if you will.
Hopefully this makes some sense.....try to relax, not too much, but be comfy, not like a super tight ball of muscle.
so relaxing and trying not to lock on target might help....