A table-top plucker is good to start with, but if you are going to keep doing this long term, you will eventually want a tub-style plucker.
We did our first birds by hand, which got old very quickly! Then we upgraded to a table-top plucker powered by a drill. (Large diameter PVC pipe with rubber fingers sticking out.) It sort of worked. You had to keep tightening the drill chuck and/or the bolts and washers holding it together or it would stop spinning. That also got old quickly!
I refused to process any more birds until I had a tub-style plucker, so we skipped doing a batch of meat birds last Fall and returned to eating store-bought chicken. (Blech.) After a while, I showed DH the options: Featherman plucker for over $1000, made-in-China knock-off for somewhat less, or the Whizbang book and kit for $400 plus probably another $100 or so depending on what you already have on hand, plus many hours of measuring, drilling, cutting, and assembling.
We went with the Whizbang kit, and *finally* got it (almost) finished in time for me to start processing the now 11-week old birds. :0
What a difference! The table-top plucker was 10 times better than doing it by hand... this is 100 times better than the table-top plucker.
Another point I don't think anyone else mentioned: to bruise, you need blood flow. Since the chickens are bled out before scalding and plucking, all that flopping around does not bruise the meat, though you do sometimes get some damage if one gets a leg or head stuck down the side of the plucker. Also if your scalding water is too hot, it seems to make the skin tear easier.
-Wendy