Ifirst of all yes DCA is the best way to buy BTc. And second I will suggest you to follow 3 step technic what I follow to buy in three step . Do not buy all in once.buy small portion  part by part . That will help you to protect from loss. Suppose if you have 100$ . You can use it in 30% at current price than wait for correction n when price down U can invest another 30% like that . But don't be panic if you buy in ATH just hold it untill you reach your target.