Hey Patrice,
I am going "nutless" on Monday next week. I was an anesthetist for 33 years and have done some homework that is very reassuring to me about the results we can anticipate from an orchiectomy.
If you are in the US then you should expect or be assertive about receiving a pre op interview that we call PAR. You are entitled to know about the Procedure in any detail you need. You should hear about the Alternatives, basically more HRT and keeping your testes. And then we talk about the Risks. Again your surgical team including a surgeon and anesthesia provider should answer your questions and help you feel prepared and at ease.
My HRT has done a great job and the spiro I nick named "man away" has my T quite low. Therefore I do not expect much difference in my secondary characteristics gains but a reduction in my drug needs. All drugs carry inherent risk and I am tired of the diuretic side effects and the fear of going back should anything happen to my HRT drug delivery line.
Sexual function is variable for us as you know. My experience and, that I hear about, is along the "use it or lose it" concept line. My trans sisters who "get it up" regularly and use it generally are functional and experience less shrinkage than those who find IT untouchable or unwanted in the first place. I do not know how an orchi would change your size?
Post op, some folks might need adjustments in HRT and we know of some who might utilize T gel or other medication options to maintain their sexual function. You will likely have pre and post lab results to compare.
I am planning to have a local anesthetic with sedation and that is so I don't tell too many jokes and start laughing. A moving target is not a good surgical field but honestly this will reduce my overall risks. My urologist is well informed and experienced with the procedure, suggested to take a half hour. I will be an outpatient and will have some tight jock strap sort of panties to wear. I will be laying around for awhile with an ice bag between my legs rather than a full nut bag. With much reduced testes size, shelling them out requires a small incision that will be generously flooded with long acting local anesthetics.
I had a vasectomy long ago but did not listen to their post op advice to not use the equipment for sexual pleasure for two weeks. Bad idea!! Swelling and infection were my reward.

Best of luck to you and keep your positive sights on your post op recovery, freedom and more space between yer legs.