Have done a few of them...Not rb25 boxes, but vl turbo, d22 navara, rd28 patrol boxes, they all are the same basic box, just minor differences.
They are a large, heavy, and clunky box. I was always amazed at how much end float the gears had. LOL.
Everything is circliped and shimed in (unlike rb20, rb30 NA boxes, which are hold by threaded nuts).
Any usually everything is DAMN tight. I was lucky enough to have access to NISSAN tools, so that puller shown above is a blessing. LOL. It can be done at home, but dont hope to get it all done in one weekend, unless everything runs smoothly.