If it is just starting to slip, you can get away for a couple of months, so you can research and plan how to do things, but you will need to take it easy whilst driving (read, grandpa camry's driving techniques. That should help)
If you are doing it yourself, plan to get the flywheel machined as well, this gives the new clutch plate the best possible chance of bedding in and lasting longer. The machining is to remove hotspots which will be present on the flywheel (especially if slipping now) and have a flat face for the new clutch. This costs around $20- $50 usually from the place you source the kit from.
The way I've done my clutches in the past is, order the clutch from a supplier that can also machine the flywheel. Remove gearbox and clutch the day before i pick up the kit. Drop off the flywheel and old clutch (if you're not keeping it) in the morning, pick up the new kit and machined clutch in the afternoon (or when they tell you the flywheel is done).
You can also pick up brake cluid for the clutch reservoir there and reinstall averything when you get home. If this is your first time, expect 2-3 hrs to remove the box and a mouthfull of colourfull language as you get aquainted with the car!
