Weirdest thing I do, remove all jagged cliff edges and flatten most mountains.
All elevated surfaces end up as a rectangle or if I have time, a square. This started when I made it part of the dwarf training regiment. I always end up killing a bunch in collapses. I think I'm flattening surfaces incorrectly... My last fort discovered the magma pipe by collapsing 3 dwarfs into it. I guess I should have noticed the obsidian
Migrants all follow this process:
*Assigned to Wrestling for 1 or 2 skill levels before champion (so they can fight later without becoming champion).
*Once they reach high enough wrestling level I grant them their dwarf name. This could be anything but it makes them show up differently in dwarf manager so I know they have completed the first process. Last game I picked character names from various games.
*I assign the dwarfs to mining and begin flatting the land. I usually pick large embark areas so this never gets done.
*Once they reach at least professional mining I assign them to build constructables like walls/bridges. If I have a project I have them do that otherwise just build some tower then deconstruct.
*Now they are assigned to smoothing. I stopped engraving because that seemed to make the value of fortress sky rocket and bring to many migrants.
*Dorfs that aren't gaining stats like I want them to are assigned to sweat shop pumping rooms. Otherwise skip to next step.
*I assign many to civilian tasks like hauling, these keep their names. Royal Guards get a RG at the beginning of their name, G for Guards, S# (s1, s2, s3) for squad dwarfs, X for my crossbow squad.
All starting dwarfs receive 4x4 bedroom, study, and dining room. Eventually they get statues and other fancy crap when my mason is legendary. Migrants receive 2 rooms, one has study and dining room and the one is bedroom with 2 containers on opposing sides. This becomes a nightmare when economy starts but I insist on leaving it on to torture myself. I try to assign dwarfs to tasks that make them decent money.
I always follow this process and its very time consuming. Sometimes I don't make it all the way or plans change.
Edit: I forgot one. I pamper the baron consort or baroness (whichever ends up being female). I go out of my way to give them things they like and make all of their stuff (except bed) out of rose gold to get a purple room. I was able to make all the walls and some of the floor rose gold once. I usually assign a squad of 2 to guard her room (in addition to the standard royal guard) and make them follow her when she feels like walking around. I also try to get exotic pets as long as she doesn't dislike them. Giant eagles are my favorite along with large felines. I think it was panthers... If I feel that I've just about done all I can for her I will start in with platinum or gold if that's unavailable for her male counterpart.