Tips:
One rain barrel is not enough, trust me on this one.
No instructions will be the right ones for you. Collect a few different directions, then think about how you need yours to look, where it will go etc. Then take a bit from here and there that you think you might want.
Go to the hardware store and look at what you chose from instructions, and look at the pieces offered at the store. I guarentee you won't be able to find the exact items on your want list, but if you spend time, you will find what you need.
Give yourself longer than you might think.
Use GE Silicone II for windows and door to calk everything tight. Large washers help hide the calk.

GGG