I was super nervous to cut into my metal downspout, but measured and eyeballed it a dozen times. Then did it! An hour later we got a big rain and this new 60 gallon barrel got filled to the brim and started using the overflow hose. I'll be using all that water to irrigate my little herb and veggie garden for weeks now.

I'm glad this kit came with an overflow hose. You might be able to see in my pictures that I routed it into the french drain of my downspout. That way I won't get any erosion near the barrel. The overflow hose was pretty long, but just about 1" short for my setup. A $9 hose from the toilet section of the hardware store fixed that though.