So the instruction is pretty good, but I am posting something on my stupid side here... Forgot to follow step 6 and 7 properly on the first bud. So in the attempt to put back the ZIF tape, I tried too hard and mishandled to break the tape. If I had taken off the glue from the ZIF tape then I might not have broken it. I did not just gave up there, and used the jewelry glue meant for the shell and glued the tape back trying to salvage from the mistake. So the magic thing is the juice still flows! Then the rest is just history, I moved on and got both buds finished. The second one got much smoother as I learned from the first. For most of the part, I'd say it could be a Medium instead of Difficult, as the hard part was to get the glue to melt on the shell. The rest will be to be extra gentle and steady to disassemble the connectors and glued parts. After that, DSEE still sucks juice like Dracula, but using the buds with full options turned on will not drain as fast as 1%/min. DIdn't do step 10, either