Step 1: You will need..
(1) A basic radio - For this I used the sony ICF-S22 (£9.98 on amazon I think?)
(2) A Transmitter to wireless headphones - I found an incredibly basic set on Ebay. - Try and get one with a headphone jack connecting to the transmitter to save your self some hassle.
-If you are a motorcyclist you more then likely have a helmet already
(1)various tiny screwdrivers.
(2) soldering iron.
(3) pliers and snips.
(4) various workshop tools.
Step 2: Opening up your Sony radio..
once these are out, flip the radio so the longest flat edge is facing you. wedge a screwdriver gently into the top join and pries open the radio.... Check out the short video for step by step details.
The transmitter I bought opened easily with only one screw holding the whole thing together!