Step By Step: How To Install WordPress
These are specific instructions for installing WordPress 2.
I hope they help!
Step One: Create a database for your blog. Create a user and access rules for that DB as needed.
Step Two: Download WordPress 2.
Step Three: Unzip the files locally and upload them with FTP to where you want the blog to be installed. Note: just the files, not the wordpress/ directory that the files are extracted to.
Step Four: Create a file named .htaccess in your WordPress directory and CHMOD 777 it. It is a blank file. This is so WP can change the permalink structure. Change the permissions back when you are done configuring your blog.
Step Five: Edit wp-config-sample.php with your DB information and save it as wp-config.php and upload it into the blog directory.
Step Six: Load your blog in your browser. If you did it right, you will be prompted to click a link to install the blog. If you do not get that link, you made a mistake or WordPress upgraded. Either way, the instructions on how to fix it should be on that page. Follow them, redo the steps above, get help or hit the comments below. Always check the publication date on your documents. 
Step Seven: Click that link. Now you should see a welcome page with a nice big First Step
[…] With WordPress, you will follow these installation instructions. You will just make sure to have a new database added so that you do not DELETE YOUR EXISTING BLOG and you will install the second WordPress in a sub directory like: testblog/. Set the config file to use the new DB and the correct directory and you are all set. Any new theme you want to use, you put in on the test blog first and make sure it does what you want. Same is true with any hacks or modifications you make. […]
[…] WordPress, you will follow these installation instructions. You will just make sure to have a new database added so that you do not DELETE YOUR EXISTING BLOG […]