[Pete Thomas]

The difficult thing with a soprano is finding the right position for the mouthpiece. It's easy to lip a note into tune, but if you start doing that, you end up having to lip every note into tune separately. Some instruments are only in tune with the mouthpiece a little more out and a tighter embouchure, some with the mouthpiece further in and a looser embouchure, different voicings with mouth and tongue. A starting point is blowing a low B, then overblow it without octave key and then finger middle B - long tube versus short tube B. If they are both in tune, the instrument is in tune with itself.

Yes, it's the Bs and C#s that are going to be the biggest issue. Get those sound as good as possible to your ear, note the mouthpiece position and use that as a starting point to lip any notes as necessary.

I agree that tuners are only useful for an initial reference, other than that they can be counter productive. You just have to train your ears to hear in tune and out of tune, concentrate on what you hear from your horn com pared to the backing (be it a backing track, a band or a drone)