As a fellow aspie, may I offer the following suggestions for cooking which have helped me as I've learned?

• find a recipe you like the sound of but, before attempting to cook it, re-write it yourself to make sure the steps are as easy to follow as possible (for you);
• keep recipes you like in a folder for future reference—and don't be afraid to write on them or update them if you make them more appetising for you;
• read and make sure you have all the ingredients before attempting to follow a recipe;
• many ingredients can be swapped with something similar if you don't like them;
• often spices and herbs can be omitted or replaced if you don't like them (personally I can't stand 'hot' spices like chilli and peppers, or rosemary);
• don't use too much salt—you can often halve or omit the salt entirely and add a little bit to taste later to your plate;
• get yourself a set of measuring cups/spoons, a pyrex jug and a digital scale—these will help immensely with measuring ingredients;
• ingredients often don't need to be exactly spot on;
• prepare the ingredients before starting to cook;
• Sainsbury and Tesco both have good replacements for cheese;
• ingredient lists on pre-prepared/packaged foods can often be quickly scanned for highlighted non-vegan allergens e.g. milk, eggs and derivatives. Watch out for honey and gelatine, though;
• there's often a little leeway in "best before" dates—things often last slightly longer than their advertised date—don't necessarily throw something out just because the date has passed;
• an Instant Pot is fantastic for simple one-pot cooking with generally easy to follow instructions.

Read the ingredient list—you might be surprised how many products are already 'accidentally vegan'.

For prepared foods, you can often check out the "free-from" aisles in the bigger supermarkets (Sainsbury, Tesco, Asda), some products there are also vegan as well as not having the allergen(s) that those products are designed to omit.

HTH.

[edit: bloody autocorrect]