Join Date: Jun 2009
Location: British Columbia, Canada
It sounds like your boss plans on easing you into things, and teaching you slowly so I don't think you should be too worried.
Daily necessities include feeding (usually 3x per day, but differs between barns), picking stalls/paddocks, turn in and out, blankets on/off, might include flyspraying, picking hooves, etc. It all kind of depends on what the barn offers to it's clients.
The temperaments are hard to tell you just from a breed. I could say one thing and it be completely opposite, it really depends on the horse. I am sure that your boss won't throw you in with a really hot horse until she thinks you're ready for it.
There is an entire forum for natural horsemanship on here, I suggest you take a look at it!
With the nervous horses, be calm and quiet. Don't make sudden movements or noise around them, and definitely get them used to having you around.
I'm sure others will add on to what I've said. ;)