When talking to professional investors, we do see that the stories are different if we ask about when they first made an investment. That is due to the fact that every single person out there has a different learning rate. Some people simply learn a lot about how to make successful investments in a short period of time. Others can even struggle for years. While most will start with guaranteed investments like Sequoia India, eventually, making a solo investment is something that is considered.
Unfortunately, we cannot actually answer the question for you since variations are so huge. It is important that you take an honest look at your current knowledge level. If you do know a lot about how to make a good investment, you can give it a shot. Just make sure that you only invest a small part of your available budget. This drastically reduces risk. Have patience and always analyze everything that you do. At the end of the day, you are your very own best critic. Do listen to yourself. If you are honest, you will be able to decide when you should make your first investment. Alternatively, you can hire someone to analyze your investments for you and tell you when you do something wrong to get more knowledge.