To begin investing in the LSE, you must set clear goals and assess your risk tolerance. Next, establish an investment allowance separate from your daily expenses. Choose a brokerage that aligns with your investment style and open an account, providing the necessary personal details. Fund your account by linking it to your bank account, and then strategize your stock portfolio based on your objectives, risk tolerance, and market research. Continuous learning and adaptation to market changes are essential to successful investing.