Few tips ejammer.
In high rank you usually do not start at base so you are going to have to come to the quest prepared.The monster could be in the same area as you when you start.
If you happen to start at base and everybody else is not near base then grab all the items and when the first possible oppertunity shows itself give out the items. Best the monster leaves the area for this.
Once you have fought the High rank equaliviant you can upgrade the Low rank armor so that it has HR defense.Skills will stay the same.
The first round of quests for High Rank is basically,Jaggi,Peco, Barroth, and Royal Ludroth among others.
Try to plan out your armor and weapon sets.Also look at what items you need for making ammo out on the field. It helps to bring the first 4 combo books too.Set up some speed combos before the quest.
Oh bring Dung bombs just in case an uninvited monster shows up.
GK maybe some time today we can do Rage Match maybe with some help though.