Another sketchbird in my book, using the Law's Guide. In information he gave on his website, he recommends using a Prismacolor Blue Col-Erase pencil for initial sketching. It's light blue and you can erase lines.
I bought two of the pencils from Dick Blick, used it on this robin sketch and then erased a bit and made changes as I went. I went over the lines with graphite after I had what I wanted with the blue pencil. You can see some of those lines because I didn't erase them all.
Although I don't remember, I have been told that I danced to the song, Rockin' Robin, in my crib when I was a tiny thing. Apparently, all they had to do to make me happy was play that song and let me dance.