[header] How to dissect a locust [title] Acquire a locust. [step] If you have locusts in your area, you might be able to. You could also use a grasshopper as an alternative to a locust. 
If you're doing this for a school project, the locust will likely be provided for you. If not, buy a locust dissection kit online so you have everything you need, from the insect to the tray and tools.