1. Invest in mind and endurance related edicts. High endurance not only increases max Stamina, but also reduces Karryn's overall sensitivity. Also enact 'Resist Orgasm', which is the skill I use mostly when waitressing, mainly to avoid breaking glassware and losing drinks.
2. Start the shift with a selection of drinks on the tray ready for immediate serving, so you don't waste time and stamina walking back and forth between tables and bar. You may have wrong beverages on the tray, but chances are you will have something that a patron is looking for. Thughs' preference seems to be beers, Guards' - spirits (vodka especially), Goblins' - also spirits, especially rum.
3. Little point suppressing Karryn's desires, unless you want a chaste bar service... which you don't if you want to get her drunk, fucked and made sip cum from a mug. The only desire I am constantly supressing is pussy, because she's a virgin after all. The only desire I am releasing at the start of shift is boobs, as boob flashing is rewarded with tips. Not as much as serving drinks and helping herself to them, but still it gets the party started.
4. Make sure she's in vicinity of clients who have drinks at the table.
5. Start her day with Bar service, when she's at her freshest and fatigue isn't negatively affecting her sensitivity and orgasms experienced already her max energy and willpower.
0. Take notes of drink orders... unless you have a seasoned waiter's memory. Not kidding, with a full house and a wider selection of drinks on offer, it will be quite hard to keep track of who wants what, especially once groping and orgasming starts. Karryn will not get drunk if there are no drinks served (with the exception of Preg Mod, where bar service has a tweak that will get her drunk for mistaking orders, if I understand correctly). It would be great if there was an edict that would equip the bar with a tab, but in the meanwhile I am using my own tablet to record orders.