I have to write a letter to my lawyer, to let him know I no longer need his services. I'm having a hard time putting into words. Don't what to sound ungrateful for what he has done in my case. Please Help.
As long as you've paid him for all the work he's done, all you have to do is say "My situation has changed and I no longer require your legal services. [You may have to add "Please send me your final bill for any outstanding work."] It was a pleasure working with you, and I appreciate the assistance you provided."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.