Get your taxes done using TurboTax

 mail the accountant's 8949 along with the 8453 and the 1099-Bs?

with the Form 6781 you will need to go to Forms mode and then open a form 6781 and enter this.  

the Form 4797 should all fill in based on the summary 8949 and form 6781 you will be completing in TurboTax.