I think there is an accurate description somewhere here you must start with a small batch anyway and ask for precise questions about details of the procedure. Leuckart is the way to go if you’re a beginner especially. You will have to achieve the successful method best done with small amounts.
Use formamide and formic acid in your leuckart and cook for 2,5 hours, separate, add caustic soda , cook. Separate and steam distilled your oil, comvert to amphetamine with h2so4