For those willing to take the dive here are MY rules to make every trip successful:
1.) What you wear
Remember to wear light and comfy clothes. Something that easy to slip in and out of. Don't wear tights or leggings. Jeans are best. Also, wearing a plain white shirt works best when trying on jeans, skirts, or shorts.
2.) Trying on everything
Don't be fooled by the sizes. Say you are a "8" and you see a dress that is marked "6" or "12", try it on anyways, you might be surprised.
3.) Don't be a bag lady!
Don't bring a huge purse or bag. It sucks carrying it around and keeping track off it.
4.) Go Cart!
Grab a shopping cart. You might be going into the Goodwill looking only for, let's say black shorts, but grab a cart anyways, you never know!
5.) Bring your own shopping bag
The Goodwill shopping bags are made of plastic and are huge. Be a friend to the earth and bring your own bag to be your goodies in.