This link should provide you with alot of the needed info.
http://www.idofishing.com/forum/showflat.php/Board/ftlgeneral/Number/994133/page/4/view/collapsed/sb/5/o/93/fpart/all
As stated above, hold the fish sideways with both hands and not by the gills. Get the fish back into the water released asap as these fish are very slow growing and very old. There is a photo of me holding one and you can see how to do it.
If you have more questions, please ask and many will help you.
try to land the fish by hand if you have a couple people in the boat. I do have a net for them but it takes a very big net and hand landing them works very well.
One important tip when handling these fish, on the smaller ones, the boney lumps on their back are very sharp and if you hold them there, they can bend thier back or wiggle and those bones can pinch or cut your finger. No teeth in their mouth either.