[General] Is this a task for intern or experienced

I am working in a small company as a intern , recently they had a project where they need to migrate a large custom crm from php5.6 to php8.4 and they have given this to me to do it alone. Now i want to know from experienced developers that is this a task for a intern or experienced developer. The codebase is around 300k loc and has lots of dependency which are obsolete for php 8.4 which i am not very sure on how to update.