Changing differential oil - 03 reg. cab

Any trick to changing the differential oil on a 03 taco 2 w. drive small 4 cyl. auto? The place I get my oil changed wants a hundred bucks which seems a bit steep seeing that it only holds 1.3 qts. with a drain plug (13/16s?) that looks like it drains like a typical oil change. Is there something I'm missing? Thanks,

Frank

 

Still can't get over shops charging that much to do such a simple task. I think they even have plastic bottles with long skinny spouts that (looks like) you could just pour it right in without using a sucker tube etc. Who would pay that?