How difficult is it? Do i need any special tools for the job?

What about the ABS unit does that need any special tools?

Nope but i don't know if it is needed to have the bike running while bleeding as it is a pump.

No need to have the engine running or the power turned to bleed the brakes. The ABS system is a pass thru system. If you  are really worried about getting old fluid out of the ABS system, cause the ABS to activate before and after the fluid change by grabbing a hand full and a foot full of brakes on dirt to get the ABS system to cycle.  I’d suggest to only do one brake at a time. 

5 hours ago, Liquidape said:

No need to have the engine running or the power turned to bleed the brakes. The ABS system is a pass thru system. If you  are really worried about getting old fluid out of the ABS system, cause the ABS to activate before and after the fluid change by grabbing a hand full and a foot full of brakes on dirt to get the ABS system to cycle.  I’d suggest to only do one brake at a time. 

that would be fun trying to bleed the brake by activating the ABS and do power slides 😛

While no tools are “needed” I would highly recommend a vacuum pump (meant for bleeding brakes) to assist in bleeding over the old fashion way of doing it.

So if i get a vacuum pump that will clear the fluid through the ABS pump as i bleed the brakes at the calipers, is there a bleed valve on the ABS pump?

No bleed valve on the ABS pump. When you bleed the brakes, the fluid gets pulled through the ABS pump. 
The reason I suggested cycling the ABS before and after bleeding is to get old fluid out of and new fluid into the circuit behind the normally closed ABS valves in the pump. Again you don’t need to do this and it’s probably overkill. 
 

An easier solution than vacuum pump is putting speed bleeder nipples on the calipers. They work great as long as you aren’t ham fisted tightening them up. They replace the OEM bleeder nipples and have a one way valve so you can just open them, connect your collection hose, and pump away on the brake lever/pedal. 

Ok thanks everyone for the information i'll give it a go.

Finally got round to it after pricing up vacuum bleeding kits at approx £50.00 for something i will do every two years not worth buying,  i got my local Yamaha dealer A2 Motorcycles Gravesend to do it for £38.00.   

There is a great video on revzilla with Ari Henning(Shop Manual). I watched it and bleed my brakes after installing "The Fix". What a world of difference. Its easy.

On 4/20/2023 at 2:46 AM, SKIPNOMAD said:

There is a great video on revzilla with Ari Henning(Shop Manual). I watched it and bleed my brakes after installing "The Fix". What a world of difference. Its easy.

So is this what fixed your brakes (rear brakes) not working post?

On 4/19/2023 at 9:24 PM, Mapbook said:

Finally got round to it after pricing up vacuum bleeding kits at approx £50.00 for something i will do every two years not worth buying,  i got my local Yamaha dealer A2 Motorcycles Gravesend to do it for £38.00.   

Wonder who’s answer was best, does no one vote?

1 hour ago, Noel McCutcheon said:

So is this what fixed your brakes (rear brakes) not working post?

Yes👍.