QUOTE(kenm @ Feb 21 2009, 10:07 AM)

"Eventually you make friends with the fingerboard."
This encouraging aphorism from my 'cello teacher turned out to be true for me eventually; more so on bass than on 'cello. She meant that if you know where the notes are on the string, you can play them right with any finger.
QUOTE(echelon @ Feb 21 2009, 04:27 PM)

How do you remember where each note is? I'm just starting to get used to the whereabouts of each note in first position? Isn't it very confusing to suddenly have everything moved? Oh, dear, I hope I manage. How many positions do you have to learn in order to play reasonably well? I want to join the amateur orchestra at some point, but how will I know when I'm ready?
Nothing's moved. All the notes you already know are still available, right where they've always been. You're just adding a few new notes (and some new places to play old ones).
It may be a bit harder to picture on an unfretted instrument but, if you look at a guitar, each combination of a fret and a string gives you a particular note. Some notes can be found on several different strings, some on only one. But each intersection of fret and string has a label you can attach to it, which doesn't change (unless you start using alternative tunings and stuff like that).
So all you need to do is get used to what note you get from each intersection, which then lets you work backwards and identify all the possible places you can form a given note. Which alternative you pick and which finger you use to do that with will vary depending on what other notes you're playing (and have just played and are about to play).
Same applies to bowed strings, except you can't see the grid because it doesn't have frets. But point x on string y gives note z. If you think of them that way rather than associating notes with particular fingers, it's easier.
This is what Ken's referring to.
If you know where the notes are on the strings, you can play them whichever way is most convenient - just stop the string at the right place for the note you want.
I'm only just starting to think about violin positions as such, though I've been scooting up the fingerboard for a while now. I have a pretty good idea of where the note I want is, so I find it by landing a finger where I think it should be and let my ears guide any necessary adjustments.
The first time I played a 3 octave scale it involved an untidy series of random shifts up the E string as I ran out of notes within reach and leaped for the next. I couldn't have told you which positions I used, but I found the notes I wanted. It's getting a lot neater now, as I've been copying what my desk partner does and shifting when (and where) he shifts.
As long as you don't get into the habit of thinking that, for example, D is "A string, 3rd finger", I don't think you'll find it at all confusing. If you think of D as being the 5th "fret" on the A string, it shouldn't make any different whether you play it with 3rd finger or 1st finger - it's still the same note, in the same place. It's just that playing it with the 1st finger makes it easier to reach the next few notes up the string.
It's like standing on a chair to reach something on a high shelf. The seat of the chair is still the same height off the ground that it always was, but you've now got your feet on it instead of your backside.