*Tip about LCS and RI:

Use air pockets if you cannot get a squeak. Basically the Lip Clamp is the setup to begin with, and if no squeak emerges, 'blow up' your face, cheeks, lips. This will help getting the squeak easier. Some people make the mistake that they tighten the mouthcorners to get the squeak, but this is counterproductive. Ther is some air between corners and teeth.

This is a good way to start LCS and RI. No red of the lips showing in the second picture, bunched chin, air pockets everywhere.
The same goes for RI. In the beginning you shouldn't be afraid to use air pockets. Maybe you will play them that way forever, maybe they will go away. I, myself, started out with huge air pockets, and now I play RI with almost no pockets anymore. The feeling and sound is what counts. Easy high note, no arm pressure. Rolled in lips.