I have three DDs with ASD, two with full PIP awards and one with DLA. They all have very different profiles.
You need to focus on the Activities that PIP assesses. For each activity, you have to consider:
Can you do the activity independently?
The rules for being able to do it independently is that you have to be able to do it safely, to an acceptable standard, as often as needed, in an acceptable timeframe (at least half as fast as someone without disability).
If you can't, can you do it with prompting? Or do you need supervision? Or assistance? Or do you need someone to do it for you?
You need to be aware that the words in the questions have very specific meanings, often defined and tested by the courts. For example 'complex information' for the reading task means 'two sentences or one complicated sentence'.
A simple meal is a meal, for one, cooked from fresh ingredients. If you can make an omelette you can be considered to be able to cook a meal.
But the effects of disabilities can stack and stop you from doing something you would otherwise be able to do, so you can state that. For example, if you work and the effort of going to work means that you can't cope with cooking a meal after work finishes, so you just have a packet of crisps, etc., then you can explain that.
For a difficulty to score points, it has to affect you more than 50% of the time. So if you are ok most of the time but struggle to bend down to tie your shoe laces once per week, it won't score.
Nobody gets PIP so that they can reduce their work hours. But some people use PIP to reduce their hours. They should bear in mind, though, that if reducing their hours at work makes a material difference to their ability to perform the activities in the PIP form, they should tell the DWP.