MS SQL to Postgres

Hi,

I am in search of the best practices to migrate from an MS SQL database
server to PostgreSQL 16

Existing DB server MSSQL with 6 Million records and 3.5 TB with 424 Tables
running from 2019 onwards.

Each table has 5 to 16 columns ( basically text, numbers, lat long
coordinates , time stamps, and images/voice file (stored in archive
folders)reference links, etc. ).

I am in need to port / migrate all this data from this MS SQL server to
Postgres16 .

1. What are the best methods and practices folks employ to do this kind of
data porting operations?
2. what are the tools and techniques to explored / employed for this
3. How much time is consumed by employing the right tools, the entire
porting of 6 million records of 3.5 TB size to Postgres 16 takes
4. Any hurdles or challenges or risks

Kindly enlighten me with the best practices and reference materials /
links or tutorials to perform these operations successfully.

Thank you,
Krishane