What is the best way to wash your hair with feather extensions.?

okay, so i'm getting feather extensions this week and i'm not sure how i should wash my hair. i'm like scared ill rip them out or ruin them. I'm also scared like they will clump together and get tangled. also when i get out of the shower i wrap my hair in the towel.. would that be a bad idea to do with the feather extensions in? Also should i be careful when i brush my hair, because i'm very OCD about my hair being brushed. Pleasee help me! hahaa