This Qi receiver for Samsung Note 2 is very easy to install and works perfectly. Note, this is only for the N7100 (or LTE N7105 variant); there are other variations of Note 2 which are not all compatible with Qi receivers, so check that you have a N7100 or N7105. To install, simply open the back of the phone and to position the receiver above the battery, taking care to align the tab with the connectors on the phone; I used a small piece of tape to attach the receiver to the battery. Put back in place, and you're done!
Simple, practical, efficient and cheap: I recommend.