My take on it:
To #1) "This is another reason for me to do this"
As for #2)
=>2a) "I know (for a fact/well) that you (will) need...to do that."
=> 2b) "I know that if you (really) want it done, you will need..."
Notes:2a and 2b have slight different in sense.
The words in parenthesis are optional.