The headjoint is the top part of the flute, which has the lip plate. The body of the flute is the central portion, and the largest, with several keys on it. The footjoint is the smallest part, forming the bottom of the flute.

Pay special attention to the ends of the pieces–making sure they are free from dirt will help the flute fit together properly.

If you’re having trouble bringing the pieces together, don’t force it. Wipe the joints of the pieces with your cloth and try again. Take care to hold the pieces gently, by the ends, not by the keys. If you forcefully grab them as you twist, you might damage your instrument.

Keep the pieces straight as they come together. Attaching them at an angle may damage your flute. Some flautists find it helpful to gently press the low C and C# keys with their thumb as the attach the footjoint to the body. [4] X Research source

Use a tuner to help determine if you are hitting notes correctly. There are many convenient electronic tuners you can try.