Have a seminar in my college the next week...

Have a seminar in my college the next week... So I haven't given a proper presentation or seminar in probably my life. I've talked on stage for about 5-10 minutes at the maximum. This is probably gonna be a 20-30 minute full blown Presentation. I'm 21 now (bout to turn 22) nd I've had my stutter since I was maybe 5-6. My stammer has phases where sometimes it's manageable nd due to some days of social inactivity it gets worse again. I aim to practice until the day of the presentation nd hopefully be able to stand without shaking my legs nd getting my mouth dry af and sweating like I'm having a bath. Some tips or advice or just some luck would be appreciated. Thank you :)