I’ve done this. It was really hard. Also the best thing I’ve ever done. I had to be very ruthless with my main job. Working strictly 9-5. This really annoyed m

I’ve done this. It was really hard. Also the best thing I’ve ever done. I had to be very ruthless with my main job. Working strictly 9-5. This really annoyed my boss and I almost got fired, but I just powered through and held my ground. I had to work every evening for about 3 hours. I developed the habit of working even when very tired. Turns out you can do calculus even when exhausted. I had to be very disciplined in saying ‘no’ to nearly all social events. (But still saw my girlfriend/now wife). This whole experience was great fun and I would recommend it if you like learning new stuff. Especially if you want to change career.