One of the hardest things to master in Photoshop is using the lasso function to make a selections.  Whenever possible, I try to avoid lassoing.   Here’s a way to select a portion of an image using the Magic Wand instead of the lasso.  This will only work if the portion you want to select is against a solid or almost solid background (for example, the butterfly image provided in the collage tutorial.

1) In the toolbox, the second tool in the right column is the Magic Wand (it looks like a little magic want).  Select the wand. Along the top bar click make the Tolerance 32, click anti-alias, and click Contiguous.  Leave the layer box unclicked.

2)  Now, using the magic wand, click the background of the image.  The selected background will have “marching ants” around it.  Now, go to the menu bar at the very top of the screen and click Select.  From the Select drop down menu, click Inverse.  Now, the butterfly is selected (should have marching ants around it).  You can now go to Edit and click Copy, then go to your new file and click Paste.