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And.

- and you're not sure... "but" would imply a contrary statement following. Two statements predicated on the same exposition, "I'm not sure", are in agreement.

If someone is a pedantic little prick and uses open forums, like meetings, to undermine your efforts then you might find it hard to keep your demeanor.

I'd like to site the first paragraph of this comment as an example. While it is accurate and relevant, it is also unnecessary and reduces the value of the statements you have made, diminishing them in the eyes of others, but to no greater benefit.

There an example; the correct use of "but".