Howdy - just joined the site but. . .
I have been reversing for quite a while now - too cheap to buy a dedicated macro!
Try just a basic 50mm lens for starters & B4 you remove it from the camera choose your aperture - start low @ ~ f4 (will give very shallow DoF, very soft , ethereal look) and depress the picture preview to allow the diaphragm to change to the desired apture. now keeping the Preview depressed unlock & remove the lens (yes - you feel like you need more fingers/hands!). your aperture is then set.
Attache your adapter to the front of your lens and then turn it to the camera body and connect as usual.
yes, you will be very close to your subject - practice on newsprint and move yourself to get the focal point set - you will need to adjust the ISO & exposure to get it all right.
its a matter of lots of practice - I brace my elbows on something and most times hold my breath as well!! lol. . .
good luck - don' give up its great fun!!