Feeling Rushed & Stressed

I'm feeling rushed.  I'm under a lot of pressure.  It feels overwhelming, but I have to do this.

I have a unique opportunity to make some great progress in a short amount of time on the house.  However, this comes with a cost.  Money.  And we're almost out of it.  So I've had to ponder this to decide what to do, and I don't have a lot of time to make the decision.

Ralph Smoot and his son Conrad (see http://www.earthshelteredhome.com) have proposed to come and help us get our waterproofing done, as well as helping me finish the slab prep work so that I can pour the floor concrete.  The thing is, they have a tight schedule and I feel rushed.

Ralph is proposing that they come out in a couple of weeks.   I think this is good for their schedule, but he also says that it'll get in before the rain returns in the fall, and it'll give the waterproofing time to cure a bit before winter.

I have some factors that stress me out on this.
   1.  It's a lot of money, but the good thing is that it's a great amount of progress in a small amount of time.
   2.  Once the waterproofing is down, we've got to protect it, so it has to be buried within a few weeks.  We have to get the place bermed and the roof covered.  (but we can't do that until the floors are poured).
   3.  Ralph recommends no berming until the floor concrete is in (for wall stability).  So once the waterproofing is done, we're committed.
   4.  We are running low on money.
   5.  There is an enormous amount of floor prep that I don't think Ralph realizes, although I've documented it for him extensively.  It may be that he doesn't consider it to be as big an obstacle as I do, although his price for helping me on this aspect is minimal.  It's worth the money.
   6.  I work during the day and haven't had time to devote to calling slab contractors to see what their labor will run.
   7.  I'll have to purchase rebar and get that delivered to the site, and I'm not sure what 3800 feet of #3 rebar is going to run (yet).
   8.  We're running low on money.

There's a great opportunity here.  By the end of August, we could be months and months ahead of where we'd otherwise be.  It's just that we'll also be out of money so work will slow down after this temporary surge in progress.