I'm about to start the Thieves Guild quests, but as I'm playing a non-stealth character my Sneak skill is very, very poor at around 17. In preparation to joining the Thieves Guild I wanted to improve my Sneak skill, as I doubt I'll be able to do their quests at my current skill.
I tried to sneak around some people at dark, but I can only get the completely hidden status and the detected status. Once I enter the line of sight of someone I'm detected, I don't manage to get the half-open eye indicator.
When I'm fully hidden or detected, I don't seem to gain any skill points in Sneak, but with my current skill I never achieve the hidden-in-sight status that I need to gain more skill. Any idea on how to gain some easy Sneak skill points?