How to work with them? Take care about lash "babies" and don't overburden them. For these little lashes, you should choose such lengths of extensions that will allow them to have the same lengths as all the other lashes do (photos below).
The less the natural lash is the shorter length of extensions you should use. And try not to touch very small lashes at all!
If you apply a thick long lash on a little natural one you'll get the sticking out lashes or even lash dislocation - the lash twists and the client feels discomfort or even pain.

By the way, anagen is a phase of active growth. That's why stickies may lead to curved lashes.
Always check your work for stickies at the end of the procedure!