Monk's Guide to the Solo Wizard
How to kill your Oranges >>>
Not for the faint of heart. It's even more dangerous because there are high and low oranges... a low orange is doable, a high orange is cause to run. Be cautious when picking out oranges to kill: if all of the mobs in a group are orange, or if you've never killed that type of mob before, avoid it. If you see one orange mob with other mobs that are the same type and are blue and yellow, it's a fair bet that it's a low orange, because it's at the highest possible level for that type of mob. That's not true 100% of the time, but in general it is. On the other hand, if you see an orange with other mobs of the same type that are red or purple, it's a good bet that it's a high orange.

Low orange: Count on 3+ resists. You might get less, but safe is better than dead. Bolt, DD, root, sprint to your sweet spot. If you get hit refresh bladeturn. If your root is resisted, try again with quickcast. If it's resisted twice in a row, run like hell.

High orange: Don't bother. It's possible, I do it once in a while, but if you manage to survive you'll have spent most of your mana, and if you manage to kill it, you were lucky. Don't count on doing it all the time. At best you have a 50/50 chance.