Hi there
Say you are working on a hand and hide everything else… even with symmetry on when you unhide everything only the visible hand shows the modifications …
What i have been doing for ages is box hide one hand, box hide the other… (So now we have the model with no hands) Invert hidden (so not we have 2 hands in space)… then hide one… alt+click to center and set rotation on the hand… then undo to unhide the other hand…
Well is there a better way to do this? As while this works still in 3.5 as i am learning so much new stuff thought i would see if there is in fact a better way to go about this 
As this has some problems… namely when you are trying to use transpose to modify the fingers symmetrically… to adjust for example length…