I have a very squirmy cat as well (does NOT like being held) and someone (prob Elise) suggested squeezing the blood onto my nail. Worked great as a starting point. Since then, we've progressed. Currently, as I'm getting her on the floor between my legs, I give her head and both ears a good rub & sorta 'milk' toward the tips of her ears - she like 'dat - then, with one hand I hold the spot on the ear I'm gonna jab & with the other hand push the strip into the meter while I grab the lancet (placed on top of the meter, no holder), quick check the bevel, do the prick & let her go (insert face in fish). While she's occupado, I squeeze the spot on her ear with a bit if tissue to remove excess blood (stop bleed & helps minimize scabbing). I have everything set up and ready to go on the side I'll be pricking before I grab her, with her treat (bit of sardines) right in front of her face.
Going into this, I did not believe we'd get to this point. As we've gotten better, I've found the 31g lancets are easier on her (barely a flinch) but require a bit more milking. I also turned off the beep on the meter.
The attached pic shows my poking box including readers & headlamp just after a prick. I said smile, but, she busy