After 2 hours I STILL can't cut and paste item to new pic...

I have just acquired Photoshop (which I have never used before) and I have sat here for over two hours trying to do a simple task of cutting an item out and placing it on another picture (EG - A car from one road on to another). I have looked on this forum, Youtube, and the photoshop manual for help and I just don't get it at all, the more I try, the more frustrated I am getting and I am STILL nowhere near working it out.

If had known that it would take me this long then I would have done it in Windows Paint!! Can someone point me in the right direction for this right from the beginning? Surely it's not THAT difficult is it?

If I can't do a simple task like this then I know I am wastimg my time and will take it back to the shop and not bother.

how exactly are you doing it? use the magnetic lasso tool i find thats the best then once u hav it highlightes press ctrl+c then go to the other image and ctrl+v im assuming thats how your doing it but if not then thats what u need to do... i think

I worked it out that way in the end and managed to copy and paste to another picture.

How do I load a new picture and use it as the new background. When I load one, it goes on to a new layer and I can't find the original one.

ok could you explain your second question again please im not sure i fully understand it its probably me just being a retard but...

uhhhhhhhh yeah, mebbe u should minimize the pic so its ina small screen on photoshop