U're supposed to carry all u're belongings.. clothes, jewellery, bag, shoes, bangles, flowers, perfume etc. and go with freshly washed hair and a bath!
The MUA will then prep u're skin with a mini-cleansing session and ask u to change into u're shirt/kameez. This is where they tuck-in a towel so u don't stain u're clothes.
Next is u're hair-do :)
Then u're makeup, eyelashes..
Flowers..
Jewellery..
Now the dupatta would be draped and attached using several pins.