overclocking laptop GPUs is rarely a good idea, most are thermally inadequate...
Make the jump to a desktop... you'll thank me later :/
Notebooks cannot handle the extra heat needed for overclock.......some models runs hot out of the box. A few years back I tried overclocking my GeForce GT425M to get better folding@home crunching results, all I done was made my already hot MB run even more so & set back to default values. Fortunately, I had removed the battery before doing this to keep the heat away from (then) a 24/7 running notebook for it's first 7-8 months of ownership. Because of what I used the notebook for, disabled updates & security, it sat on a steel shelf to help absorb heat, was gaining close to 6,000 points per day.
Later would acquire a desktop & once I seen the GPU performance, shutdown folding@home on my notebook & would continue to run on my PC instead, gaining over 13,000 points per day.
I noticed that you stated you lucked up on getting the notebook you have, ask around, get the word out, you may luck up in the same manner & gain a PC. Today, I get so many offers for 'rehoming' unwanted PC's that I have to turn most down, or accept & donate to the local Hospice store. Don't give up, someone will have one with your name on it!