Just got contacts for the first time. Any tips/things I should know?

I've been wearing glasses for the past couple years and only now have gotten into contacts (about 6 hours ago). Had a bit of trouble getting them in at first at the optometrist's (took me about 10 minutes) and eventually got them both in. At first my eyes were a bit irritated and started watering up, but now later in the day they feel much more comfortable. I'm fixing to take them out in a bit, is there anything I should know for future contact experiences?

Also, my contacts are monthlies. I get a new pair every 6 months.