Vista - Windows Updates after repair install

I have Vista Home Premium 32-bit.

I did a repair install with my Dell OEM, which has no SP1. Therefore, I uninstalled SP1 before doing the repair.

The repair was successful.

I now want to do the Windows Updates. I cannot see SP1 in the list.

Question 1: How do I find SP1?

Question 2: Due to the fact that SP1 incorporates pre-SP1 updates, should I install SP1 first? I assume that this would prevent it from installing pre-SP1 updates

Question 3: There are 75 updates. Any one of these could cause problems. Therefore, should I download the updates in date sequence, and in batches of 20? This would allow me to reboot after each batch of 20, so any errors would be in that batch.
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You can get SP1 from microsoft.com