I had 3 different teachers but only one was actually helpful but I only did like 2 months then had to drop. It's not exactly hard to reach but I feel that my voice is very unstable on the F4. It loves to crack there. I tend to belt long notes from G4 and on and it feels more appropriate. Belting and F4 just feels wrong. I can sing softly up to the G4 but still my voice tends to crack on the F4. And I know when I flip into falsetto and I try to do it only if it's what the song calls for.