Allen Key set
Pliers
10mm Socket
8mm Socket
White grease
A couple of minutes
Right first of is the Brake lever which is the easiest (there both very easy though!)
Firstly place an allen key in the top bolt on the old lever and then undo the nut from underneath (Item B) next use the allen key to undo the bolt that goes through the old lever and then pull it up and out. (Item A)
Now your lever will be removed and when they are placed next to each other they will look like this...

You need to remove Item C (the brake presser thing) from the old lever to reuse on the new one. I did this by winding the adjuster all the way in so that it stuck out as far as possible then just pulled it out with some pliers.
Once this part is out slot it into the new lever from above like this...

Once this is done just place the new lever into position ensuring that the hole lines up and that part c is pushing on the cylinder and place the bolt back in the hole like this...

(I used a little white grease on the bolt just to give it a helping hand)
Then screw the bolt (part A) back in using the allen key and then the nut on the bottom (Part B) whilst holding the bolt still with the allen key.
Finished. One New brake lever!!