I've actually been cutting for quite a while now, since around June. Started with a normal diet, just cut snacks and **** out, watched my portions, etc. After a month or two I started cutting down on carbs. I still drank milk and had carbs around dinner time but for breakfast and lunch I tried to eat eggs/meat/cheese only. Over time I restricted carbs more and more until I was eating pretty much on carbs on days I wasn't lifting weights. Once I moved back to college and had was able to stick to a more strict diet I started following a CKD (cyclic ketogenic diet). For the first couple months I was basically eating no carbs 6 days out of the week, and refeeding on Sunday. It was working great for a while, I have no problems with energy while on very low carb diets and I've never noticed any problems with being in ketosis (some people get headaches and feel crappy while making the transition).
Diet was 60 - 70% cals from fat and 30 - 40% cals from protein. Carbs are usually under 20 - 30 grams a day. Macros would look something like 140 - 150 grams fat, 230 - 240 grams protein, ~20 grams trace carbs.
People that don't exercise can stay in ketosis for long periods of time since they're not worried about muscle mass. Since I lift and am not taking in any carbs, the only source of fuel for my muscles is stored glycogen. After a week's worth of lifting most of your glycogen stores are fairly depleted, and you'll need to refill them in order to continue lifting the following week. If you do not properly refeed on a keto diet you will definitely lose muscle mass. On Sunday I was eating anywhere between 600 - 1000 grams carbs. I kept protein lower, between 150 - 200 grams, and tried to limit fat as much as possible. Obviously I'm gonna have some comfort food after dieting hard all week, so it's pretty hard to keep fat's extremely low when you're eating a couple pieces of pizza and ****. When I'm strict with my refeeds I can get in 800 - 1000 grams carbs and keep fat under 60 grams. The point in eating low fat during a refeed is due to the fact that you're taking in large amounts of carbs all day. Fat doesn't necessarily make you fat, but fat eaten with lots of carbs has a much higher chance of being stored in adipose tissue.
Lately as I continue to get leaner I've noticed my energy levels dropping by the end of the week and some of my weight sessions from Thursday or Friday on to Sunday were getting increasingly ****ty. I decided to add in a second carb day on Wednesday to help me get through the week. I only eat around 400 grams carbs on Wednesday in a 5 - 6 hour time frame, starting right after I lift weights. The second carb day seems to be helping a ton and I've been noticing some decent gains again since I've added it in.