My nose is big length wise. 6 cm long and 4 cm sticking out. Can I make it smaller?

If you post or send some photos, we can make some digital images, and also give useful advice about what kinds of changes are possible.You should understand that making very large changes in a nose require advanced techniques, techniques that most plastic surgeons cannot handle. Be sure to read the section in the "Web reference" link on how to stay out of trouble while searching for a rhinoplasty surgeon.

 A rhinoplasty procedure can accomplish making the nose smaller by shaping and sculpting the cartilaginous and bony framework of the nose. Computer imaging would be helpful to understand  what can and cannot be accomplished with the rhinoplasty procedure with your nose and facial features.