That is exactly the kind of thing I needed to know, thank you! I imagine I'll have to learn this kind of thing at every turn at first, you guys are very helpful.Yeah the 400V ones look too big to fit very well (you might be able to lay it sideways just for a laugh though), but be careful with those 6.3V electrolytic caps, most pedals run at 9V or higher and 100uF sounds like it might be doing power filtering duty, so you should preferably have at least 15V rated caps there, maybe 25V or more just in case someone (or you) runs it at 18V at some point. I'm not confident enough to say that it will explode for sure, but I wouldn't use it to be safe.
Yep, it is annoying and tricky at first, but it does get much easier. The electrolytic caps are really the hardest ones, since you need to keep size and voltage in mind (and getting higher values in the required voltages means they can be too large, at times). It's not really an issue with most other parts though. Of course IC's can come in SMD configurations, but that's not as easy to mistakenly buy the wrong one.That is exactly the kind of thing I needed to know, thank you! I imagine I'll have to learn this kind of thing at every turn at first, you guys are very helpful.