Hi. Wet pitching is no fun but it has to done at times. It's best to do it as quick as possible so there are a few things to consider. What way is the pain coming from and wind? Start that end first and work away from it. You should avoid fighting with a giant kit. ! If it's windy try if you can to use a Bush or tree behind you to break the wind.
Ventilation. Always keep tent tents open even when it's raining, this will keep condensation to a minimum. Lastly, if it's wet always use a foot print ground sheet as this will be an extra layer of protecting if the ground is sodden. Happy camping.