Technically speaks, you can do any auto repairs on your own if you are confident in your abilities and have all the tools to do it. That said, replacing the timing belts in your car is definitely a more advanced level of repair and definitely not the kind of thing you want to try to do on your own if you have any problem with your car's hood. Not a lot of working experience is below.
If you've already done some repairs on your own, and you're pretty confident you know what you're doing, then you can always give it a try if you want to, but we're definitely a fan of some people.
Recommend to follow closely along you can check out some videos made on the internet or at least by mechanics who have youtube channels that can walk you step by step through the process so you can actually watch Find out what you need to do and if you're unsure about a step along the way.
These videos make doing home auto repair a lot easier because it's like having a mechanic on call to show you what to do. In general, we would recommend that you do not attempt to do this task yourself, as there is a level of complexity involved.
He wanted to take it by himself; just be aware that if something goes wrong, it can cause some serious damages to your engines in the long run.