My three best recommendations:
1) Purchase of an inert trainer canister as similar to the live model as possible, preferable more than one, to determine best draw technique, effective distance and number of shots. Empty trainers are excellent dry practice tools too.
2) User should not stay in place too long while firing. Continue moving while firing simultaneously if possible.
3) It is discreet and socially acceptable to have spray in hand while moving in a transitional space, i.e. in a parking lot, returning to your vehicle after leaving work.
You know more about your acquaintance than anyone else on this board, so you are in the best position to assess/inquire which of the following videos will be something they will actually watch and learn from. For example, they may not care to sit through Mr. Haggard's overview of OC or managing unknown contacts.
David Nance of Sabre:
John Correia (approx 1:00 mark, "across the ears, and from top to bottom." Hosing someone down with a long, sustained stream is more likely to delay effectiveness):
Chuck Haggard (playlist as previously mentioned. Some deployment is practiced in the last video)
John Murphy (timeskip to 4:06 in case the embedded link doesn't work. Model is Sabre Red Mk6 which has a clip designed for left-side carry):
Annette Evans:
https://www.facebook.com/onherownlif...6082394359726/