I did it just recently actually. It's my first grow. It works. I fimmed first because I wanted to control height on a Sativa and then 2 days later I realized it wasn't going to be enough so I went down and supercropped them about 6" down from the fimmed top (I had a 12" plant)
The plant will want to heal it's stem first so it will attend to that before regrowing the FIM. Keep this in mind because if I had known that I would have supercropped first and then fimmed for faster fim growth with the supercropped(healed) stem.
Here's what it looks like supercropped,
![IMG_4729.JPG](/data/attachments/2388/2388854-9dcf13e370e913357ba3e47d60c95446.jpg)
(You can see two big knuckles on that branch bent towards the wall) and then the fim growing after the stem recovered
Should be totally fine