I'm playing a Guardian for the first time and I'll be leveling almost exclusively solo. I assume I should trait into the red line for solo leveling. Should I use a shield in Red Line or will I have sufficient survivability for solo leveling without it? Is the added survivability of having a shield worth the trade-off of weaker dps using a 1-hander? Sorry if these questions seem really basic (aka stupid) but this is the first time I've leveled a Guard.