Obviously, you will need to practise your presentation numerous times. It can be challenging for individuals with busy schedules to find time to practise, but it's crucial if you want to deliver an engaging presentation. I am well-known in the office for staying up late the night before a major presentation and practising repeatedly. If you really want to sound excellent, write out your speech instead of winging it; if you're apprehensive about public speaking, a script is your best friend.
Try to practise where you will give your speech. Some acting experts recommend rehearsing lines in various situations, including standing, sitting, with arms wide open, on one knee, on the toilet, etc. (Okay, that final one is optional.) The more you vary your stance and environment, the more at ease you will be with your speaking. Perform a rehearsal for a friend or colleague, or record your presentation and play it back to determine which areas need improvement. Listening to recordings of your former speeches can reveal poor behaviours you may be unaware of and prompt the age-old question, "Is that truly how I sound?"