Stab in at an angle to the abscess, once you're under skin and think you're in, aspirate back and create a vacuum. If you don't see a yellowish/oily/brownish/blackish substance start filling syringe, keep your vacuum with your aspiration going and you have to change angle/depth of syringe to get the needle tip to puncture into the abscess. If you do it slowly and with the aspiration vacuum you will start seeing the stuff fill the syringe when you're inside. Then you can start slowly drawing more. Worst case scenario if you can't get inside it from the point you entered skin you withdraw needle and get a fresh needle/syringe and try again at a slightly different location.
You don't have to entirely drain it, just try to get all of it you can, especially as you're going with a 23g needle the tear on the abscess wall will cause the remainder to leak out with a little pressure/heat and the thing itself will dissipate over 1-2 more weeks.
Then as a precaution, watch for fever as this means the stuff was infected and your body could not fight it off successfully and it went systemic. You need antibiotics ASAP if you get a fever after this. Systemic infection could literally be a life/death situation so don't mess around there.