29 Practice!
That should give you a starting point.
Use the dichotomous keys available to try your hand at identifying the insects provided, to order only for now.
When you are comfortable using the key, and have a feel for the orders of insects, you should start thawing some of your specimens and identifying them to order. Knowing the order will help you determine where to put the pin, so you can get your specimens safely mounted.
As always, please ask lots of questions!
To what order does each of these insects belong?
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