It depends on what sort of gym it is - if its mainstream, then yeah, many will just go and try and claim your space, but if its a b-building gym, then most all in there will know the deal re. supersets, and should cut you slack as you will inevitably do for them when they use the technique.

See how you get on, but if its not viable, then we can work around it for the legs, upper body shouldnt be a prob, as you can usually secure 2 sets of 'bells at a time.
Don't let the door hit ya' where the good lord split ya'