Q.HI, I Would Like To Know If I Can Grow A Emu Bush From Seeds Or Do They Have To Pass Through An Emu\’s Gut First? Can I Prune (
cu t back) the one I have in my garden now as it is getting very leggie?

Certified GKH Gardening Expert
This process is not straight forward. Here is a website that addresses the issue, quite, in depth:
http://www.anpsa.org.au/APOL6/jun97-5.html
If you do manage to get some germinated, the care is simple:
https://www.gardeningknowhow.com/ornamental/shrubs/emu-bush/growing-emu-bushes.htm
As far as pruning goes- I would only do so when there is dead growth, or infected growth.