Begin by setting up both PostgreSQL and TiDB environments if they are not already running. Ensure both databases are accessible and that you have the necessary permissions to read from the PostgreSQL database and write to the TiDB database. Additionally, make sure you have the necessary tools like `psql` for PostgreSQL and `mysql` or `tidb-cli` for TiDB installed on your system.

Use the `\d` command in `psql` to analyze the schema of your PostgreSQL database. Document the structure, including tables, columns, data types, keys, and constraints. This information is crucial for recreating the schema in TiDB. Pay special attention to data types that may differ between PostgreSQL and TiDB.

Using the schema information gathered, manually create the equivalent schema in TiDB. You can do this by logging into TiDB using `mysql` or `tidb-cli` and executing the `CREATE TABLE` statements. Be mindful of any data type differences and adjust accordingly, for example, converting `SERIAL` to `AUTO_INCREMENT`.

Use the `COPY` command in PostgreSQL to export data from each table into a CSV file. For example, you can run:
```
COPY table_name TO '/path/to/export/table_name.csv' WITH CSV HEADER;
```
This command will export the data in a CSV format, which can be easily imported into TiDB.

If there are any data type incompatibilities or format discrepancies, use a scripting language like Python to transform the data in the CSV files. This step ensures that the data conforms to the schema requirements of TiDB.

Load the transformed CSV data into TiDB using the `LOAD DATA` statement. Log into TiDB and execute:
```
LOAD DATA LOCAL INFILE '/path/to/export/table_name.csv'
INTO TABLE table_name
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n'
IGNORE 1 LINES;
```
This command will read the CSV file and insert the data into the corresponding TiDB table.

After importing the data, verify that the data in TiDB matches what was in PostgreSQL. Run a series of SELECT queries to check the count of records and sample data points. Compare the results with the original data in PostgreSQL to ensure consistency and accuracy. Make any necessary adjustments if discrepancies are found.

By following these steps, you can manually move data from PostgreSQL to TiDB without relying on third-party connectors or integrations.