My first HDR image
 

I did the tutorial about the screwdriver. It didnt go so wel hahaha. But i am stil workin on it.
So i started a new scene and startet playing with the effect. This is what came out of it, and i am happy. But i just started with HDRI yesterday so i can juse some tips.;)

Thanks;)

Well if you are using Image Based Lighting, which I think you are, you need to change the mapping to Angular. That way there is no hole in the HDRI. I cant crit much because theres nothing really to crit about, I mean, those are just spheres ;)

oh, btw about those holes, you are using the actual probe for the HDR image. The probe is the little reflective ball thing that you use to make the image. So my advice would be to do a google search for HDRI SHOP. From there, once you download the program, you can then change it from that reflective ball to a dome for nprmal HDRI. Hope that helped ya, ;)

Wel i changed it to angular and it looks allot better. I will definitly go and google for the HDRI shop.

Thanks you have really helped me out here. ;)