Help with Green bearings RP 400

Hello . Need some help here . Sent my 8 3/4 third member out to shop and had a new set of 323 gears put in it . I ordered a set of RP 400 Green bearings for it which are a sealed non adjustable bearing . I am getting all kinds of different opinions on the subject of removing the thrust buttons in third member . My question is .Can anyone tell me or show me how this is done in detail as I am not educated on this at all . Don't want to put my third member in and have to pull it back out . And do these buttons need to be their . Thanks , I appreciate all the help I can get on this