Ask about load charts, sling angles, hardware checks, and wind. You get the short answer, then the steps. Davina will not invent a capacity or sign off on a pick.
Match the load chart to this crane and the setup you are actually in.
Use a known weight, not a guess, and include the rigging.
Read the sling tag and the angle the way that chart defines it.
If the setup is not on the chart, there is no capacity. Stop.