We recently purchased a 2001 Toyota 4Runner for yours truly.
Other than being a little dirty on the inside, there are some significant rust issues. A nearby autoshop was going to charge nearly what we paid for the 4Runner to fix the rust. There's a lot of work involved in doing rust repair the right way. So, it was off to yt for me, where I found the holy grail of all amateur rust repair videos.
How to Repair Rust on Your Car Without Welding (No Special Tools Needed) — ChrisFix
I watched ChrisFix's rust repair video a whole bunch of times before I finally felt like I might be able to do the repair myself.
I ordered the products he has listed in his description box plus a few more and I got to work.
If you feel like rust repair is something you can't do yourself, take it from me — with a little patience you absolutely can do it. Because I did. And I am not good at these things.
Here are ChrisFix's product links:
Glass Filler: http://amzn.to/2zdSA6o
Gold Filler: http://amzn.to/2xtzWTx
Adhesive Remover: http://amzn.to/2zduvfU
Spot Putty: http://amzn.to/2yauidi
Body Patch Mesh: http://amzn.to/2iGmSri
Dust Mask: http://amzn.to/2xu4017
Sanding Block: http://amzn.to/2iaKNLM
Also here is the link to the respirator I HIGHLY RECOMMEND you get before getting into the sanding marathon that is rust repair.