Please explain what does testicular cancer look & feel like?

Ususully no Sx...: Most of testicular cancer are discovered by TSE (testicular self-exam) or incidentally by sexual partner. The only finding is a non-tender hard lump on/in testis of variable size. No pain poses no urgency to seek medical attention leading to delay professional Dx. So, see urologist whenever you may feel/palpate a suspicious nodule in or on testis. Do TSE correctly like women perform self-breast ex