Leandra
Dear Leandra,
I use the knot method, which I think its the easiest and secure way to re-root! Hair weave is good to practice with since its cheap and can come with a lot of hair.
I use a 5" needle to root my plugs, got mime at Joann, but they are found at any craft stores and sites that sells doll hair.
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Some tutorials I find helpful
http://www.wideeyedgirls.com/rerootinstruction.html
a video on how to do a part
http://www.youtube.com/watch?v=VuUXcRFbWY4&feature=related
Good luck! ^-^