I've went on my own to all of my viewings. I had taken notes of what to look for from the buyers guide on here, and having read loads of random threads on here, I knew what to expect of the car and when I thought the dealer was chatting s**t or not. Wasn't going to bother taking my Dad unless I was happy with it myself. Go check it out myself, if I'm happy with it, then go back with my Dad for his opinion.
I've seen about 7/8 and yesterday I saw one by myself and was happy to put £100 deposit down. Went again today with my Dad and he was happy with it as well.
I have to say, I am really picky before I buy anything. I will always double check, triple check just to make sure I'm not buying the wrong thing or overpaying etc. Like last week, the TV I wanted came back in stock but I had to re-read the webpage 3/4 times to make sure I wasn't misreading lol can never be too careful with big purchases. Even yesterday, I said I was going to put a deposit down to the guy but still checked the history again before doing so.
Only go yourself if you're confident you know what to look for and expect. And only put a deposit down if you're really happy with it and the price justifies the condition, history and work to be done. Make sure you get a receipt, and if private, proof of address. Plus point of getting my Dad involved was the guy eventually caved in to re-MOT it (due in April) within the price.