The flute scale determines how well the notes play in tune to each other, octave to octave, and also determines the timbral balance of the notes. From a mechanical standpoint the flute scale is a function of the following: the diameter of the flute tube or “bore” the size of each tone hole.
There are 12 major scales (that begin on each of the 12 notes in any octave). The simplest major scale is C major, which has no sharps or flats in the key signature and is one of the first scales that beginners learn.
In general on a flute, the highest octave is the most difficult. Two scales, both two octaves long but one in the lower range of the flute, for example, starting on D and one in the higher range, for example, starting on B, could be very different in difficulty.
The longest flute approximately 40 inches, from the woodwinds family, the OM flute produces a deep and soothing sound. This flute has been specially designed to reach an octave lower than the usual flutes.
Both have their easier and not so easy aspects : I found it easier to get an acceptable sound to start with on the clarinet, and also found the posture rather easier. Once you're going on the flute though, a lot of the basics will fall into place with practice (and good guidance).
Which is easier? The flute or the trumpet? The trumpet is more difficult to start learning initially, but in the long run when comparing in all categories both instruments are of equal difficulty. The trumpet's main difficulty in comparison to the flute is the trumpet embouchure which requires intense coordination.
Generally, ensembles will perform at A4=440; most flutes are designed to play at this (and a small range of other) pitch levels. After tuning your A, using a chromatic tuner, play a mid-range note (such as G) without looking at the tuner.
Sound and tuning. The predominant scale for Native American flutes crafted since the mid-1980s (often called "contemporary Native American flutes") is the pentatonic minor scale. The notes of the primary scale comprise the root, minor third, perfect fourth, perfect fifth, minor seventh, and the octave.
Absolutely right. You can definately teach yourself. Now, if you were in a position where playing the flute would become a profession, or even a serious hobby by playing in a small band, a few lessons would definately help in the beginning or even long term.