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Don't worry. Like most automotive maintenance items, it's fairly self-explanatory when you actually do it. It's simpler to do than to read.
The only advice that I will reinforce is that you should clean your flame trap at the same time, and consider cleaning out your air intake valve as well, since these items are all located in the same area (the flame trap won't make a difference in your idle problem but needs to be done once a year or so, and the air intake valve actually could be involved in your idle problems, so clean it in conjunction with the throttle body). None of this is difficult or confusing once you identify where things are and what they look like. All three of these items would probably take me almost an hour because I've done them before a few times on these cars. For you, figure on maybe 2-3 hours of leisurely work. And don't worry! Just have fun with it. You can't really screw anything up here, which makes it one of the more enjoyable minor maintenance jobs. Just follow the FAQ instructions and be careful not to get any of the carb cleaner on the throttle switch.
If you do all three of these items, the only things you will need to buy in addition to your basic tools will be the throttle body gasket (get it from a Volvo dealer), a can of carb or throttle cleaner, some rags, some Q-tips to clean out the air valve, and maybe some pipe cleaners to clean out the small flame trap hoses.
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