Mistakes in qiraat

Q:

1. How will one correct themsleves if they make the follwoing mistakes in Salaah.

1.1. Doubt which word it is and so reads both e.g. ya'lamoon and ta'lamoon

1.2. Gets stuck and cannot complete the ayaat

1.3. After completing the salaah (nafl or fardh) realise they read an ayah incorrect or missed out a part 

Checking to see when haidh terminates

Q: I have been having great difficulty figuring out when my period ends. I usually do not see a white discharge after my menses so I often have to keep checking for dryness. I read that the way to check for dryness is to insert a cotton ball or tissue and see if anything is left on it.

My question is (I'm sorry if it is a bit graphic):

1. What does it mean exactly by 'insert'? As in right before the inner lips of the private part or actually 'insert' into it?

2. Do I let it wait there or remove it immediately?

3. How regularly should I do this?

I would appreciate an answer according to the Hanafi fiqh.