Getting a good one still kinda is a pain especially if you don't do it in a group(even just 2players, the more the better). On T10, keys drop most of the time and you get 2-3organs per kill(2guaranteed, sometimes 3) so in like an hour you can get a dozen of amulets or so even solo, a lot more if you group though. Finding a really good one takes a while though since it needs to both roll at least decently and roll a decent passive. With socket autorolled though it tends to be alright to find a decent amulet, like it won't be perfect but you can roll main stat+socket+crit/crit dmg/ele% fairly easily and you can get a non optimal but decent passive(like the ones that reduce dmg done by enemies when you hit with x which tend to be suboptimal for defense but are still ok).
Obviously you can be lucky and get a godlike one on first craft.
Also to note, you need a fair amount of forgotten souls before you should bother.