It's not hard but there are many steps...
You'd be best served by first getting and IPL and a service manual.
In short
- empty the gas out!
- remove air cleaner
- take of the tank handle cover (screw underneath at rear)
- unhook carb throttle linkage
- take off carb
- unhook wires to shutoff switch/throttle rod
- remove manifold boot spacers (inside and out)
- Pry off the white plastic covers on two rubber buffers
- remove the screws inside the three buffers
- Pull tank slightly forward and unhook the impulse line from the crank case
- push shut off wires though tank grommet
- pull tank off....
However... your tank "leak" is MOST likely a bad fuel line... So just pull the carb and check that first..