sa DIY, in 1 day, hindi ka naman mag spent ng significant time researching (given na hindi complicated ang case). in my experience, i was able to read on my free time in SG. if determinado at walang budget, makakahanap ka paraan hehehe
diy or with agent, ikaw rin nmn ang gagawa/kukuha ng requirements ng skills assessment mo, example sa EA skills assessment, ikaw naman ang magsusulat ng CDR mo at i think rereview lng ng agent.. ikaw rin naman ang magrereview ng ielts or PTE exam mo, ikaw mag assikaso ng pagkuha ng documents mo like employment docs, passport, birth cert, nbi clearance (unless agent will do this for you) afaik, agent will just check if complete ang docs mo.
if naintindihan mo ang process, which is kaya tlgang gawin, naitatawid mo itong proseso na to.
again, i only recommend this if limited budget ka at hindi complicated ang case mo.