The most I would say is that you should do tomorrow exactly what I am going to do myself, which is to look down the list of people who are offering themselves to you for your vote, read what they profess to stand for, and vote for the person whose values and sense of priorities most closely reflect your own.
I'll be voting for Siobhain McDonagh again, as I think she is diligent and honest. (I also think that it is good to spend more money on sending letters to your constituents than any other MP.)
It is hard to vote Labour but I console myself that at least it is a vote against Gordon Brown.
(P.S. "David Cairns had ambitions to enter House of Commons but was barred due to the House of Commons (Clergy Disqualification) Act 1801 and the Catholic Relief Act 1829 which prevented Catholic priests from being elected to Parliament. To rectify this, Siobhain McDonagh introduced the House of Commons Disqualification (Amendment) Bill in Parliament on 16 June 1999, but the Bill fell. The government subsequently introduced the House of Commons (Removal of Clergy Disqualification) Bill to remove these restrictions, which passed on 11 May 2001." Fancy that! Never heard of it.)