Another option is to get a seat that isn't the typical Graco infant seat that they outgrow sometimes before they are even a year old. With our second baby we started right out with a Britax that went from 5-65lbs. It was meant to stay in the car. My daughter is 31 months and it's the only seat we've had to buy for her.
Something like a mayawrap might be a great option for you for carrying the baby. It is a ring sling so you can adjust it with one hand. Once you get it pretty well adjusted you would then only make minor adjustments when you take the baby in or out. You can nurse baby in it hands free as well which is really nice. And you can carry baby a variety of ways so you get a lot of bang for your money.