#1 Don’t tell a soul
#2 Consult a respectable lawyer and accountant
#3 If possible set up some kind of corporation that can claim the prize rather than you personally
#4 Spend wisely
I don’t know a lawyer or accountant I can trust not to steal it. Based on that signing the ticket is my only option.
Listened to an interview a year or so ago of a big lottery winner ($200 million range), he hired very good lawyer, public relations person, CPA, financial adviser and ex banker(not the same role as CPA or financial adviser he just kept track of money and moved it as needed). Still had same team and all the money after 6 or so years. PR person handled all requests for donations, charities and investments this kept nut cases and scammers away.