It will be a low turn out election. So honest.y do not under estimate the tories ability to pull a rabbit out. Low turn out is to their advantage.
Just remember under FPTP refusing to vote for the lesser of two evils. Is a vote for the greater.
Also watch local polling. This election changes many tory safe seats. But also seems to be predicting changes in the most likely party to win against tories. So keep an eye on the numbers in your constituency. So you can choose the lesser evil most likely to lose a tory a seat.