All the single steps are not too difficult.
The problem can be the variety of skills in the different levels. You have to be able to do some soldering, some programming, and some hacking and modifying, beside worrying about your talk.
Lucky you that you don't have to do the wireless RF12 library too! (It is complex!) This has been done by several people and is available at www.jeelabs.com
. I provide my own version and ready made scripts in a following step.
Then there is your talk! Better not prepare this presenter and the lecture at the same time!
(In fact I started putting it together on the morning of my universe presentation (accelerated expansion of the universe for a group of seven years old...:-)....this was too late! )
And the last bit of software, the laptop sketch or Flash movie has to work smoothly, "better" than powerpoint! Do some good testing...