I'm not sure what you're confused about -- I think the best advice I can offer is to re-read the instructions (here: http://www.poolforum.com/pf2/showthread.php?17055 ), especially the 2 sections entitled "Intex-type Pool 7 Day Start-up Plan" & "Intex Pool Care Plan"
The first section tells you what to do WHILE you are filling; the second section tells you what to do AFTER you are full.
To some degree, the whole point of that process is to offer a "Just do it -- you don't have to understand why" method, and let you gradually understand the 'how' and 'why' over time.
I can tell you that you will 'break' the process if you skip or leave out any bits. If you are very lucky, it may not matter too much on your particular pool, but then again, it may results in the dreaded "GREEN GOO" sooner, rather than later (or never).
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