Updating a theme for Wordpress

Familiarity with the use of FTP clients and the setting of file/folder permissions. I need to upgrade a Thesis Theme for a website. The process is as followers: Disable all caching plugins (W3 Total Cache, WP Super Cache, etc.) and, if applicable, WP-Minify. If you’re using Thesis 1.7 or newer, visit Thesis → Manage Options, and then click “Download All Options” so you’ll have a backup of your current Thesis settings. Next, back up the /custom folder from your existing Thesis installation to your hard drive. Upload the new Thesis 1.x folder to your /wp-content/themes folder. If your backed-up /custom folder is from version 1.6 or newer, you can upload it directly into the new /thesis_xx folder and then proceed to step 7. If your backed-up /custom folder is from version 1.5.1 or older, please proceed to step 6. Rename the /custom-sample folder to, simply, /custom. Instead of uploading your backed-up /custom folder, copy its contents, and paste it all into your newly-renamed /custom folder, which should also contain a file called layout.css. Set the permissions of your new [login to view URL] file to 666. Make sure your /cache folder’s permissions are set to 775. Inside your WordPress dashboard, go to Appearance → Themes, and then activate Thesis 1.x. Visit either the Site Options or the Design Options page, ensure that Thesis is not giving you a warning about the file permissions on your [login to view URL] file, and then hit the Big Ass Save Button.