Tired of doing the Thieves' Guild jobs every time you join the guild? Me too! 125 jobs takes way more time than I want to devote to it, so being the big console-cheater that I am, I found a way to speed it along.

Step 1: Go to Delvin Mallory and take a "numbers" job.
Step 2: Open the console (~ key) and type in "setstage tgrfo 50" Hit enter and close the console by hitting the ~ key again.
Step 3: Turn in the quest.
Step 4: Repeat as needed until you get enough "jobs" finished in one town for a special quest, or until the Thieves' Guild has been fully restored.

Note: This is a PC only cheat.