To my understanding you are completing the exposure work correctly. Your goals worksheet does not need to have goals which are related to one another. For example my includes - staying at home alone, going to my local shopping mall, going out for a meal with my family. These are just a sample ... you can have as many as you want the reason the have suggested 5 or so is because this is more managable. You can always add more at a later date when you feel you are on top of one or two of the original ones.
I have the got my exposure plan, which is just a detailed list of exposre excersises that will hopefully help me towards my end goals. For example staying at home along for 30 minutes, with my family close by. Staying at home for an hour with my family close by, stay at home alone for an hour with my family further away........etc etc.
There is no time limit on the exposure plan, you should keep doing items of the exposure until it no longer cause you any anxiety and then move on to the next step in the exposure plan, until you reach your final goal. If one item is too tough, then add an extra step, if you find one too easy, then skip to the next step in the list.
I am currenty doing three of my exposure plans, the first one staying at home alone, the second is going into work and the third is going shopping. This seems managable to me and I can usually fit plenty of practise in each week to make me feel like I am making good progress. So my advice here is to do as many or as little of you exposure goals as you feel comfortable or can mangage time wise.
I hope this helps, and this is based on my own understanding of the programme and my own experience. Let my know if you have any further questions. :)