A) This is a question I get asked frequently and my first answer would be to ask "is it your first spanking?" Then my next answer would be;- it won't happen, due to you having it in your head and your head being all powerful you will instantly challenge yourself, in that your brain will be saying "I am not going to cry, I am brave...do it as hard as you like!" You can't stop this action because you have asked the question already therefore, are expecting it to hurt so psyche yourself up for it and fight against it.
The idea is to get your head completely into the role that way you can let yourself go and become the person who is being told off and deserves a spanking.
If you are used to receiving a spanking then no matter who or how hard it is you will never be reduced to tears unless the person administering has a knowledge of you personally and your traits then they can use these against you during the role play session in a hope they can get through to you to induce tears. Besides which if you want to be reduced to tears I wouldn't be spanking very long as it would have to be done straight away with no warm up and personally I prefer to warm a bottom up as I enjoy over the knee spankings <grins>