Back when I was doing all my own work (as in, when I had my NEW 1974 Subaru GL wagon

I don't have a service manual or torque wrench--just a metric socket set and some wrenches. My wife is driving this car from NY to Maine in two days and I want it to have new belts. Is this a piece-of-cake job I can figure out just by looking at things, or are there any issues I need to keep in mind? Actually I don't remember replacing a belt that uses a tensioner, so I'd be feeling (no pun intended!) my way through this--though it seems pretty straightforward. TIA for any advice!