Snap
I have signed up for a one week package to watch the Open but we will have to watch on the laptop, as the Now TV icon on my TV only allows movies.
Its not automatic that if you have the icon you can access all channels on Now TV but if you can on yours, its very straightforward to access once you sign up. We have the icon via YouView which is what limits us.
https://www.theanswerbank.co.uk/Media-and-TV/Question1614809.html
My advice is not to be tempted to sign up for the full Sky package hoping you can just use the 14 day free period and then cancel, as loads of peopel complain that its impossible to cancel and the payments just keep being taken from the bank account. So pay once and be done.