Below you will find a couple video links.
One is how to install a package in general.
The other is how to install a package during rainy weather.
Installing Package Bees in a Langstroth Hive video:
Hiving Bees in Rain and Sleet
Quickly check food stores
Inventory Equipment: Clean/Prep/Repair
Order additional equipment needed
Order package bees if needed
Catch up on beekeeping reads & watch bee related video
Try making beeswax candles & yummy honey treats