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I'm sure M_V's advice is good, especially for track riding.
However, for road use it seems to me one needs to be self sufficient. Tracks are not covered with flints, shards of glass or potholes. You will need to be able to cope with problems at the roadside.
As M_V implies, it can be difficult to mount tubs and get a perfect result. I've certainly had problems and I think there are tubs which are actually impossible to get completely even and smooth - especially around the valve on cheap training tyres.
Perhaps I'm showing my age with this last remark - I doubt whether there's such a thing as training tubs now, because you'd have to be a bit crazy to train on tubs when a. no one else does, so no one's going to have a spare if you run out, and b. wired on 700's are so good there wouldn't really be any point in using tubs.
clubman-
I'm sure M_V's advice is good, especially for track riding.
However, for road use...
My advice for road use would simply have been... don't!
Nah, @nick_h. you do you. I'd keep an eye on those tyres though, a lot of the trackies bought in bulk when Planet X did a 'too good to miss' deal on Vittorias a few years ago and I know some of them have been binning the brand new unused ones they have waiting in reserve as they've been cracking, delaminating and puncturing with increased frequency.
M_V
This makes good sense