My biggest advice for anyone is to not ignore the traditional advice. Secular meditation practises based on Buddhist meditation take the practise out of its context in a quick and forceful way. Buddhism has had 2500 years to slowly develop and work out what works and what does not. It is quite dangerous to take it and call the parts that do not immediately appeal to the secular western mind, like devotion, worship, c…
I've been noticing an increasing trend of people saying things like this, and I don't get it. Meditation has many forms and traditions, within and without Buddhism. Which ones are "safe" and which ones aren't? Is using Headspace twice a week enough to be dangerous, or is there some lower bound where meditation practice without Buddhist beliefs switches from harmless to dangerous? And are Hindu or Christian meditation…
I don't think the argument is usually "meditation without Buddhism is dangerous" but rather "meditation techniques taken from their context can be dangerous". Regular mindfulness or insight meditation can cause shifts in mental state that a person isn't used to and they may not have the tools required to deal with it in a healthy manner.
It's like the mental equivalent of a normal person suddenly starting the same workout routine as an professional athlete, or even just an experienced weightlifter. They might be able to do the exercises, but they don't have the context provided by having a coach/being in the sport/etc to provide them with tools like "how to fall properly" or "knowing a torn muscle versus a normal sprain". That doesn't mean that doing the exercises in general are bad or that you need to do sport foo in order to exercise.