There comes a time in everyone's life when they need to find a therapist. Okay maybe not everyone but probably more people than you think. If you have any inclination that talking to someone might help you manage your life - go for it, as I often say I haven't met a person that wouldn't benefit from a little therapy. I mean they probably exist but I bet they don't have access to the internet. You may have preconceived ideas about therapy or people that have therapy but don't close you mind to it too soon. It's better than, I don't know, working through your stuff on a blog...
Do your research: Therapists come in all shapes and sizes, you might want someone to help you delve into your childhood or maybe you're looking for some motivation and need a kick ass life coach. Don't let your lifestyle get in the way, there are therapists that can work via Skype or phone and if you don't have the funds bang on you GPs door until they refer you to someone. If you're in the UK It's Good to Talk is a great place to start.
Do your homework: Take some time to think about what issue you may want to bring to the table, don't get too hung up on what that issue is SPOILER ALERT: you may well find the thing you need to talk about isn't the thing you think you need to talk about. This will be the start of understanding that whilst therapy may be a challenge the real work will happen outside the room.
Don't be concerned if you hate them a little bit: If you find yourself disliking your therapist for no apparent reason, it may be because they are reflecting back to you the darkest parts of yourself. Of course therapists are people too and they have the potential to be as lazy, offensive or inappropriate as anyone so please remove yourself from any situation that feels unsafe.
Be judgemental: You have to spend a lot of time with this person and tell them your deepest concerns so once you've covered the basics like location and costs, it's okay to pick them just because you like the font they use on their website. Picking a therapist is more of an art than a science. Think of it like choosing a great date but without the snog at the end.