Agree with KK on all her points. The studio white with Negligee is lovely for those who don't want an obvious French Manicure. I have a client that has this combination every 2 weeks, she loves it, it makes her nails look very natural and exactly like her own just much cleaner iyswim?
I use Negligee mainly as I don't have Beau yet but ordering that in this month. I also used M&R on a Mother of The Bride a few weeks ago and it was lovely but very pinky/peachy so not for those who want a really natural look.
And in terms of application, I always swipe, I personally find that much easier. I obviously try not to get it on the skin but it has never worried me if I do, it's easily cleaned up and I'm more bothered about getting the perfect finish than having some cleaning up to do. But I have a very steady hand, I think Holly's method of working down the nail is great for those who maybe struggle to steady their hand.
HTH's
ETA - Don't be worried about moving your clients fingers where you need them either, otherwise French application is even harder. I sweep my brush and twist the clients finger to the side at the same time if that makes sense?