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Confidence in your volleys will come from lots practice.
This pairs exercise will help you develop the control of the ball you will need to return serve to the rear court. This is not like long solo volleys as the 'feed' is coming to you from cross-court just like a serve.
Constant adjustment of your feet position is important for every shot to make the racket work easier..
If you are worried about your timing, try using a shorter swing but hit the ball higher on the front wall to compensate for less power. Focus on using the big, strong muscles in your upper body rather than the smaller weaker ones in your forearm and wrist.
Progress this to simulate a straight volley return, by volleying long and straight down your side wall, before returning the high cross-court shot for your partner to hit. It is important with the straight return to turn your upper body more to face the side wall. Your footwork will need to be spot on here too.