The company my husband workded for laid people off when my little guy was 3.5 months old, and he ended up consulting in NYC for a month, then we moved to TX after that. I traveled with my son by myself SEVERAL times (CA to NY to TX two times!) and it was really not bad at all. I had him in my carrier (Ergo baby carrier), and took my carseat with me using a go-kidz attachment (turns the car seat into a stroller so you can bring it with you). People are pretty helpful. Have your friend get diapers/food/etc so you don't have to carry much. It's summer time, so you don't need a lot of clothes. Pack light and enjoy! Maybe your friend has some friend that could lend you a stroller for the visit. You can rent them, but that would cost more than buying.
I hardly ever traveled as a young person due to family fear (Not mine). Just pay attention to signs, ask nicely for help, leave extra time, and let your friend know so they can help you - have them meet you if possible so you don't have to worry about that. But super-shuttle is available in all cities, so if you have the budget, they can take you from your airport to your friend's place with little worry. Feel free to contact me if you like. :)