Haven't yet, but I will. I picked up Monogram's P-41B and Hawker Typhoon kits in 1/48, from an eBay auction. They're bagged, with no instructions or decals.
I built the Mustang when I was a kid, and it's a relatively simple kit, in terms of the parts. I built a Typhoon, but it was Revell's 1/32 version.
As was noted above, it helps to have some knowledge of the subject. But I keep hearing in my head a line from Tim Allen's standup routine from years ago, "...and when I was done, I had a whole bag of real important lookin' stuff left over..."