You definitely want to use a solicitor to do your will for you. It is worth paying for honestly and find a reputable high street solicitor LOCAL TO YOU through recommendations AND one where the firm has a long history and looks stable (more than one or two partners). You want one that is still likely to be in existence in some form or another when you die even if it's been bought out. This is less likely with a one man band.
If you are desperate you can use a free will writing service (but loooking at your asset description it doesn't look like you will be)- many charities promote this during Free Will Week. I actually myself went with a friend to investigate this for them but my experience is if you can afford to pay, I wouldn't bother. They do it because they are heavily promoting use of the firm as an executor (ie. the person that after the death has to deal with the estate - reporting the value to HMRC, apply for probate, put together all the assets (so sell ISAs, close account, sell property if applicable) and then give it to the beneficiaries). A professional executor will be paid out of the estate and it can be very expensive. Just think about how long you can be on the phone to your bank for a minor query - then think about doing that 20 times and how much billable time there will be. Some will work on a % of the estate which can be £££.
If you want someone independent, if you have any friends who are professional people, reasonably intelligent and reliable and willing to do it, I would ask them and at the same time leave them a few thousand in the will as a compensation for their trouble. They can work in conjunciton with a solicitor and it will be much cheaper than having an paid-for solicitor executor to do the whole thing.
A property
Shares with my employer
One pension pot
A stocks and shares ISA
Crypto investments
2 cats
A typical will will deal with the whole estate rather than 'portion' stuff up specifically. ie. you leave the whole of your estate to your husband. It all gets added up, sold and given to them. Shares +death pension payment + ISA + crypto + sale of property = X. X is then given to the beneficiary or divided by the number of beneficiaries.
You can however portion stuff up if you want to but this may make it more complicated and more work depending on how many beneficiaries.
If you are married and have a spouse or children, there can be tax advantages in respect of leaving a home to them but this is why you need a specialise probate solicitor to advise you.
Main point is: you do want to get a solicitor with expertise in inheritance, wills,estates and probate to write your will for you. It is absolutely one place where getting some online idiot to fill in a standard form for you as a 'will writer' is a total false economy.