So since I bought the bike it's basically been a pogo stick..It's like riding a bucking green bronco on the track. Nobody wants to ride it

The rear shock is completely unresponsive, so it's just riding on the spring. Also really black sooty oil leaks from the valve stem when i check with the pressure gauge. I suspect it will need bladder seals(or whole new bladder?), new oil and possibly piston seals in the shock..
I see the procedure for removing the shock is fairly simple...I was sure I would have had to remove the swing arm, brakes, chain, etc..
Are there any special tools needed to disassemble and rebuild the shock? Will it be worth it just to remove it and have it professionally serviced?
Thanks
