1. Under-pricing

2. Over-committing

3. Failing to sell

4. Always saying ‘yes’

5. Not following up

via freelancefolder

1. The biggest mistake freelancers make is turning self-employment into an excuse for self-indulgence.
   
2. I never liked the word “self-discipline” until I became a freelance copywriter and coach.
   
3. Self-discipline doesn’t mean beating myself into submission.
   
4. As a freelancer, you have to work hard even when you don’t have any work to do.
   
5. Sometimes it seems that freelancers buy into the “if you build it, they will come” fallacy.
   
6. Here’s the truth: Unless you have the self-discipline to work at your business – even when you have no assignments – you will not get very far.
   
7. Don’t despair.

via top7business

Mistake #1: Buying the Wrong Things

Mistake #2: Trying to Sell to 'Everybody'

Mistake # 3: Trying to Convert Unbelievers

Mistake #4: Not Qualifying Clients

via ezinearticles

1. Not defining success. 
2. Not budgeting.
3. Not distinguishing between need and want.
4. Not organizing receipts and invoices.
5. Not keeping a logbook or logfile.
6. Not having multiple skills.
7. Not saving.
8. Not investing.
9. Not reinvesting.
10. Not being pragmatic.
    

full list via freelanceswitch

1. Missing deadlines.
2. Charging too little.
3. Lack of preliminary research.
4. Choosing the wrong clients.
5. Getting too personal.
6. Letting off steam.
7. Not proposing a follow-up idea.
8. Not having multiple income streams.
9. Allowing yourself to slack.
10. Failing to be yourself.

via freelanceswitch