Take it one step at a time. I know a 2.5 hour ippsec video is super long. but if he spends 10 minutes on something, maybe you spend an hour on it. if youre new to gobuster, run gobuster the way he runs it. then try different switches. read the man page. dont just look at it to solve the challenge he’s solving. try to understand everything that’s being done. play games with yourself - “if i change this argument, this will be different in the output”. if you’re right, you understand it. if not, figure out why.
also, take notes. break down into sections like recon, web recon, database, etc. start a big outline. everything you learn a new tool, write it down in there.
at the end of the day, you just have to practice and practice. it will come.