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unlocked 3GS, upgrade 4.1 to 4.3, which method to use?

mgh

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I have read quite a bit on different methods to use, but I am confused about some of the differences.
Some say do not use redsn0w if I need to preserve baseband. I have 6.15.00 baseband, so it needs to be preserved.
Some say use snowbreeze, but must have ibooty. Others say use snowbreeze, but no need for ibooty.

I am unlocked, with 4.1 and 6.15.00, and everything is good.
I want to upgrade, as there is an application I want that requires 4.3.

Sooo, looking at this quide: ***Moderator Edit***
i
t states that using simple mode is OK most of the time, but then it says use expert mode if you will be using phone on an unofficial carrier.
I will be using T-mobile, so I need to use expert mode correct? So that I can check the box for "activate iphone"?
I do not need to use the "preserve baseband" mode, because the 6.15.00 will be preserved in either simple or expert mode?

Once I am done with snowbreeze, I will then need to install Ultrasnow via Cydia?
Then a third step to activate the phone on an unofficial carrier?

Sorry for all the questions, there are so many options out there, and some seem to contradict each other.

Thanks for any advice.
 
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