What will a person look like after FUE Hair Transplants?

The biggest challenge I find for patients is their haircut after an FUE procedure.  We shave an area on the back of the scalp and thus patients have a funny looking haircut for about 10 days or so.  In the first few days there is scabbing on the grafts as well which is noticeable. So yes, people will be able to tell.  This is a surgical procedure. It is not feasible to think that you will undergo a surgery on your scalp and nobody be able to tell.  How your hairline looks depends on the quality and experience of your surgeon.  Make sure the doctor you choose has a lot of experience doing hair restoration procedures and also make sure the physician is doing the graft extraction and not his "assitant". 

You can see some before after photos of what FUE looks like a few days and immediately after on the LINK below.

While you will have some crusting at the recipient site for some time
post-op, after that, you'd be hard pressed to find signs of the
procedure. The transplanted hairs typically fall out and start to
re-grow around 4 months later. So, aside from hairs that are in
different stages of growth and length, it's not a huge red flag.  Your hairline will be meticulously designed by the surgeon pre-op.  Depending on the number of units needed will determine if you can get the desired results after one session. Visit
with a facial plastic surgeon, plastic surgeon, or dermatologist that
does hair transplanting for more information in person. I wish you
well!

Yes, it is hard to hide a transplant at first.  You can look better with a transplant but that is not always the case.  

The post below talks about FUE results 5 days after and shows pictures on a patient that is somewhat typical. This FUE is treated just like a regular hair
transplant with regard to the recipient area, but the donor area has open
wounds which require daily washing with soap and water. Within 3 days of
surgery, you can resume full activities, heavy exercises if you wish. The
recipient area requires daily washes as well to keep the recipient area free of
crusts. I generally recommend the use of a sponge and supply my patient with a
surgical sponge to fill with soapy water and press on the recipient area daily.
By repeating this daily, all crusts can be washed off without any fear of
losing grafts. IF any crust are present, use a Q tip and dip it into soapy
water, and roll it on the crusts and that will lift them off without dislodging
them, but never rub them, just roll the Q tip on the recipient crust. I like to
see no evidence of any crusting in the recipient area and the crusts from the
donor area gone in 5-10 days with daily washing,.