yeah it would affect things..
i guess u gotta make changes to how u do things..
u gotta..

make some adjustments

Good grief can't see why they should be, judging by England's performance so far you could get a bunch of 13 year old schoolboys in and they would beat England.
As for Slovenia's confidence I don't think there is a need to worry

I am so nervous people. I think Wayne Rooney will be under a lot of pressure. He needs to score.. I think It will be everything ok, since Slovenians are not that experienced, and will be under pressure too! So I think we have chances, because they will make a lot of mistakes.

I am really nervous, I cant work anymore, I am finishing at 3PM, but can't contribute anything at the moment. My productivity is ZERO! :D zomg.

I am so nervous people. I think Wayne Rooney will be under a lot of pressure. He needs to score.. I think It will be everything ok, since Slovenians are not that experienced, and will be under pressure too! So I think we have chances, because they will make a lot of mistakes.

I am really nervous, I cant work anymore, I am finishing at 3PM, but can't contribute anything at the moment. My productivity is ZERO! :D zomg.

Yeah, if you haven't played in a long time it may be strange adjusting to the height difference if it really is that large. You would need to bend your knees differently for ground strokes and all you really need to do is practice and get used to it. Serving is usually much easier for taller people because they can hit down on the ball more than a short person. Again, just practice and you will quickly return to your former consistency. Good luck :)