Arrive to Àger is very easy:
From Barcelona or Girona:
From Lleida or Tarragona:
While in Àger, you only have to follow "Zona de Vol" or "Coll d'Ares" signs. There is only one road that goes to the Montsec (mountain). You don't have to take any dirt track, all is paved road.
One image is better than 1000 words...:
At Sant Antoni lake we don't have any phisical location, we depend on water level... but we commonly meet at "Xiringuito" bar-restaurant, just near the "beach".
Arrive to Sant Antoni Lake is very easy:
While in La Pobla de Segur, you only have to follow signs to Aramunt. Some images may help you: