Mike, you got some good advice above and some that I don't agree with. So I'd like to share a few things that I feel are important.
There is NO starting point. Don't believe it, don't buy into it and don't practice it. If you record a sound that doesn't have enough low end in it to start, you'd not just high pass 100 Hz.
Let's look at a guitar. Some guys are into high end sizzle thinking a tone is more distorted because of it. You know...like picture a sound recorded without speaker sim or something. Razor sharp, harsh and usually without much bottom end at all. Taking out 100 Hz or even 150 Hz "just because that's my starting point" will totally destroy this particular sound.
Kick drums....*most times* unless you're dealing with bass drop kicks or dance kicks, 20 Hz ain't gonna do a thing. If you have to high pass that low, you made a mistake during the recording process. I've never recorded a kick drum in my life that needed to be high passed at 20 Hz or even up to 30 Hz. I see 0 activity in those ranges on a freshly recorded kick drum whether it be from a sample or a real mic print because I make sure I don't print a sound with subs that low.
A good/properly recorded bass guitar is going to hit in a similar low end area as your kick but it can go from 30 Hz and even reach up into the 130 Hz range for low end. That 30 Hz depends on if it's a 5 string with a low B and you actually play the low B in the song or you decided to push 30 Hz via eq pre-print. We do it no justice high passing 30 Hz if there is no 30 Hz rumble in the tone. See my point? It all depends on WHAT YOU record that determines WHAT YOU remove.
You wouldn't high pass a dance snare from an 808 kit "just because" of a starting point. You wouldn't use a starting point high pass on toms if the sound you recorded doesn't have low end "woooosss" or a rumble of low end air so to speak. You would just look for the offending frequency and curb it if it exists. You have to know when to high pass something and when to sculpt a particular offending frequency because if you just high pass, you can remove the good stuff in a track.
So my point is, identify where you need to high pass before you "just do it". Don't listen to "I usually"' from people because they are NOT dealing with the sounds YOU are recording.
When you high pass, you will hear a blanket of lows that sort of sound like wooooooossss or wussssssssss in the background if you listen close. You sweep your frequencies with a good amount of high pass going on until you indentify where it is and then hone it in and back it down.
The same with low passing, but the sound you'll be looking for is sisssssssssssss, eeeeeeeeeeesssssss or shhhhhhhh and you'd just sweep through the frequencies to find out where it's coming from. When you low pass, identify that the instrument needs it. Some don't have harsh high end to where they need it removed.
In THIS particular situation, I actually recommend soloing things up for high passing because if you don't, you'll never hear the blanket of wooosssss in the background that is cluttering up and masking your other instruments. But for low passing, you should be able to get away with handling that without soloing up your instruments.
Once you get used to this and know what to look for and listen for, you won't have to solo things up anymore...which you really shouldn't do unless there is a problem area. But until you know how to listen for these artifacts, solo up if you need to. Just try not to get into instrument sculpting while in solo mode. You're only soloing here to listen for the low end artifacts in the background. Hope some of this helps....good luck.
-Danny