Yes, basically your bbt will rise once ovulation has happened due to progesterone rising. Before ovulation temps are usually below 36.4 (mine are usually around 36.1-36.2) and then afterwards they will go up and stay up until your period (mine end up somewhere around 36.5-36.7). Usually, there is a BBT spike of a few tenths of a degree the day after you've ovulated, but some people (including me) get a slower rise over a few days.
Individual temps are less important than the trend, if that makes sense, so don't get too caught up on working out what a rogue high/low temp means.
Take it at the same time every day, before moving, sitting up, etc. I set my alarm for 6.30 and keep my thermometer under my pillow, so I can grab it, take my temp and then go back to sleep without really noticing.
I use Fertility Friend to log my temperatures and it tells me when it thinks I've ovulated. Sometimes I disagree with it, but it's useful for keeping track and it makes charts for you.
The book Taking Charge of Your Fertility is also quite good for explaining it all if you fancy more detail. I'd read lots of online stuff, but I liked having it all laid out clearly and in depth in one place as it made it easier to understand somehow.