rhitwik macro photography is a different genre altogether ....u need different equipments and different techniques.
1. Macro photography dont need autofocus...better use manual focus..its more accurate
2. dont use f2.8 for macros ...u will have to go down to f7.1-f8 to get the whole subject sharp ...bokeh u will get easily due to magnification, dont worry about it.
3. You will definitely need a external flash with diffuser for macros coz when you go soo close ur popup flash can not light the area...and diffuser coz u wont want ur subjects go blind after ur photo.
4. at 1:1 thats at the highest magnification its too difficult to handhold the lens and camera ...for two reasons which are you have to go around 6-7 inches close to the subject and subject will fly /run away if its insect ....you can not see the insect through viewfinder...you have to use the back lcd ...better make a proper distance from the insect even if u have to loose some magnification...you can just crop the pic later.
5. strengthen your forearms
... you can imagine the dslr+lens+flash = 1.5kg in your hand stable for long time ...a slight movement and pic will be useless