Here is some help Pauly,
First off grab the pen tool,
Then Zoom in till you have a good view, control+ will zoom in (Control- zooms out) Then click around the edges of what you want to cut out you should get little boxes where ever you click like this.
Continue on around you desired area,you may have to turn the trasparency down on the top layer so you can see it you can do that in the layers menu,
Once you have you fighter completly cut out close the loop by clicking on your original box and right click and select make selection.
Experiment with feathering, personally I like .5 Pixels if your a little rough you may have to go bigger, (Feathering will make the outer edges semi transparent to help blend) If you think you think the outside is to transparent just duplicate the layer (Right click on layer) and play with the transparency of the duplicate. Do this only after positioning and sizing though as other wise it will be to hard to place perfectly.
Once you have made your selection you can copy and past, to resize your cut out just go to edit free transform and drag the corners just remember to hold shift and it will kepp things in perspective by maintaing you height/width ratios.
Make sure to select the picture layer when copying and dont select copy merged or you will copy both layer and may end up with a colored layer over your pic.