Displaying text on player screen upon touching sector/starting map

[Keeper]

I'm working on a multiplayer map and would like to be able to use text on a player HUD

A- Lua, SOC and lump editors intimidate me, so I would prefer not to use them if possible (though I have a feeling I'll have too)

B- I've asked this question before and am asking again now that I have more map-making experience