Video introduction to microinjection:
Rosen JN, Sweeney MF, Mably JD. Microinjection of zebrafish embryos to analyze gene function. J Vis Exp. 2009 Mar 9;(25). pii: 1115. doi: 10.3791/1115.
This is a great video. Very well put together and a very clear depiction of how microinjection works.
I had never heard of JoVE before. It is a great resource for videos on how to perform experiments (limited number of videos, but the ones there are of very good quality).
Back when I posted that link, JoVE was open-access. Unfortunately without prior notification they changed their business model, and now require subscription. I understand the need to generate funding -- these videos are costly to produce. However, you now need to access the microinjection video using a subscription or single-payment.