BBT Tips

I’m on CD2 and I’m considering temping this cycle. The last time I tried, FF thought I ovulated based on my temps but that cycle ended up being 90+ days long. Needless to say, I’m worried about temping again as it’s clearly wasn’t accurate (due to my own error, I’m sure). I know the basics, but does anyone have any tips on how to make it more accurate? I’m a restless sleeper and I don’t wake up at the same time every day so my temps are basically all kinds of wacky.