You can check out your local library and see if they will lend you a Kill-A-Watt, mine does. What I have found mostly is that things have standby mode and don't draw much power. If you do need to unplug things consider getting a powerstrip and using the switch on it, I found that with the Kill-A-Watt there is no power drain from a powerstrip being turned off. I use this on my stereo receiver + TV + Raspberry Pi + sub woofer.
There was an interesting idea that someone had where he switched his bathroom fans to timer knobs. I found them at Home Depot for $17 a piece and haven't done it yet myself, but the idea is that you can turn it on for 10 minutes after taking a shit and clear the air in the bathroom and not worry about wasting electricity because you forgot to turn the fan off.
The timer switch can be taken advantage of, and is why I am still considering it, for clothes drying. If the room you are drying in, say a bathroom, has one then you can close the door and turn the fan on for 10 or 20 minutes to suck the moisture out of the room while the clothes are drying.
I did notice that my electric bill dropped quite a bit once we warmed up and are no longer using our central air blower. Another consideration, but very small savings, is if you have a dual band router you can shut off either the 2.4Ghz or 5Ghz band if you are not using both or can get away with using one or the other, that will save about 5Wh.