Everybody has their own way of doing this thing, usually after trying a billion things to find out what REALLY doesn't work, and what's left is what sorta does.
To me, an extremely sharp razor is essential. I use a single pass shave, generally. I stretch the skin really tight and keep my shave angle very low, almost dragging the spine. As long as I stretch hard, and keep the angle low, I get a very comfortable shave and close enough for my purposes.
A perfect BBS is simply not needed, unless you are in military boot camp and your drill instructor likes to scrape his ID card over your face to test your shave. Especially on your neck, nobody notices.
The direction of the stroke doesn't have to be exactly WTG, XTG, ATG, whatevah. The sharper your razor is, and the better your stretching and shave angle and stroke technique, the less it matters, and conforming to precisely the correct direction is pretty much impossible in places. Just approximate WTG as close as you can, given the limitations on this imposed by your topography, and you will be okay. Sometimes my stroke ends up being almost exactly ATG in the interest of convenience.
As you will see in the video below, many factors can be ignored or discounted or compensated or compromised, as long as the razor is nice and sharp and you exercise firm control over those factors that you can easily adjust, such as pressure, stretching, and shave angle. You don't even need an expensive razor. A $15 ebay beater, if it can be honed properly, can deliver a great shave. A $20 Titan. A $4 Gold Dollar. And exactly following the classic instructions to go precisely WTG then XTG then ATG is not sacred dogma that you must follow to the letter to avoid the flames of shave hell.
https://www.youtube.com/watch?v=5OrmjAc7KE8