... but that's exactly what I mean.

If there is something you are interested in and you know NOTHING about, it will take considerable time to learn AND understand the topic. Then you will have to put it into practice numerous times and reflect on your experiences. And probably do further research to clarify new questions that came up. Only after that will you be able to deliver an excellent presentation. This will take time .....

If you are under pressure time-wise (which I presume you will be by now), then present on something that you know a lot about and do some research to fine tune.

Regards,
Fyzzio