Do people always have one or more guardian angels, and what are they allowed to do and not do?

There is always an assignment of a guardian, and often multiple guardians. This is, in part, a reflection of the life plan, where the individual is joining the fray, the area of the world, the location, and family they will be a part of. All of the variables of life and the circumstances for the incarnation will govern the level of divine support and protection deemed appropriate for them. Some are at greater risk from the outset because of the circumstances of their launch, being more at risk, for instance, personally, and will meet with great danger quite quickly following their birth. Others have gentler circumstances, but everyone everywhere is targeted by the interlopers, so there are truly no safe havens. Everyone can be reached. Everyone can be interfered with and everyone is vulnerable in many respects. So there is simply just a question of time and the degree of effort required to reach a level of corruption sufficient to undermine the person functionally in a way they are thrown off track, and then may begin to falter, and will fall behind, and have an increasing risk of greater difficulty and failure in life with all that can result. What is considered the luck of the draw, of course, is preplanned entirely. And this is done for tactical reasons, to put a person where they most belong for the purpose of the current incarnation, which is often to take on significant challenges from unfinished business in prior lifetimes. This is why people end up in some of the worst places on the planet, facing the greatest degree of adversity with inevitable suffering of an extreme kind. It is not bad luck, it is something that is predetermined by prior experience, and actions, and will be determined by the Law of Karma, to a significant degree, in what unfolds for them on their return to life in the physical.