Oh cool, I haven't raided any legendaries yet as only started playing at the end of Jan. Hit level 25 today and have some decent Pokémon so might give Lugia a go over the weekend hopefully I won't be on my own like every other non legendary raid.
Try to find a Discord server or Facebook group for your area. That's really the only way you can reliably participate in Legendary raids, unless you live in like Tokyo or something.