Installing Simpson HDU5 hold downs

Bob,
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I don't recall the exact Simpson hold downs we used in our house and garage, but we had to accurately place the bolts before pouring our foundation walls. I bought all the parts I would need ahead of time so I wouldn't have any suprises later with unavailable supplies, and could make accurate measurements for locating bolts.
Our garage walls bolted right to the top of the perimeter foundation, so we only needed to locate the bolts somewhere between the studs.
On our house, the bolts had to extend up through the floor framing and tie into posts in the wall framing. So, I had to really plan ahead there, locating where the floor joists and studs would be before we even started pouring concrete. It's not a huge effort, but it does mean thinking ahead a few steps.
I simply screwed a 2x2 across the tops of our forms and drilled a hole in the middle for the anchor bolts/hold downs. I screwed the nut on to keep the bolt from falling down, which also helps clean the concrete off the threads after the pour by simply unscrewing the nut. This made it easy to locate the hold down accurately, while holding everything securely during the pour.
We built our house back in 2003/2004 here in Washington state, and all of our rebar, anchor bolts, etc. had to be in place and tied securely before we could even pour the concrete. Same with any water pipes or electrical conduits.
I'm pouring a small sidewalk in a few weeks that will need four bolts located accurately for deck posts. I'm planning to use little pieces of scrap plywood with a hole in them to accurate locate the bolts. Simpson makes special little plastic brackets to do this, but for small jobs like mine it's easy enough to use some kind of scrap to hold the bolts in place during a pour.
Good luck,
Anthony