To make this judgement we must first identify how Solo we want to be.
Solo Factionless or Solo in a Faction
From my experience is only viable up to level 10 or so, when the main story has you join a faction. to be factionless you must then switch over to the town board and start grinding. This will be your only source of quest.
YOU WILL NOT BE ABLE TO PVP OR PLAY THE STORYLINE!!!(this kinda upset me)
Viable but difficult. So make sure to perfect your build!