Adamantine wrote:It is fine to commission someone to hang flags for you: it is important they are consecrated by a qualified Lama with mantra, sometimes done during a sang ceremony, first however. Without consecration, it is believed the flags won't be potent. Ideally, if you commission someone they will also know some prayers to say on your behalf at the time the flags are raised and dedicate for your benefit specifically, (along with all sentient beings generally, of course.)
It is also the best to have them hung in sacred places where Buddhist saints have walked before.
And it is important to avoid hanging them on days that are astrologically determined to be bad days to hang flags: hanging them on these days can create obstacles rather than raise lungta. You can find out the contraindicated days through the Rigpa calendar or other Tibetan astrological calendars.
And lastly, it is important to hang them in the morning, when the sun is still rising in the sky, prior to the noon zenith.
ONE last thing: it is most ideal to use pure cotton flags: although the common nylon ones made these days may last longer, and are cheaper to make and thus buy, they are toxic to the environment and so will have the mixed result of aggravating local spirits, protectors, and so on, specifically at the time of disposing of them properly -- since flags must be burned once they've deteriorated to dispose of them respectfully, and burning the nylon gives off terribly toxic and noxious smoke and fumes.