I've just turned on 'Search Network' to give it 24 hours or so, to see if my conversion rate improves or not - yet I want to compare 'Google Search' stats (what I've had it as from the beginning) with 'Search network' stats (what I've just added in). What's the easiest way to do this? I want to compare CTR, clicks, impressions, conversions etc, but it appears that it's all lumped together. Any advice appreciated.
You need a domain referrer report. This is offered by Google Analytics and other 3rd party tracking tools.
another simple way to do it is to turn off google search for a while, whilst the search network is left running. You could then compare the 2 date ranges within the account snapshot overview.