Hi there,
If you struggle with tech have the Biometrics people do it. If you are reasonable with tech it's not hard but does take quite a long time.
For our first Spouse Visa we spent 2-3 weeks collating docs as the whole process was new to us and we were figuring it all out.
The final visa took about a day to scan and upload - by then, after nearly 6 years of doing this over 4 applications, Spouse, FLR(M), ILR and Citizenship, we had all the docs prepared in advance.
My recommendations:
1) Get all your docs ready and sorted first.
2) Use a half decent scanner not a phone scanning app.
3) 150-300dpi in black and white is recommended.
4) Collate each set of docs into a PDF file
5) 6MB is the max per file so if a set of docs exceeds that like Bank Statements or Correspondence chop it into a Part 1 and Part 2.
Good luck
p.s. also vaguely relevant: Do your Life in the UK test as early as possible, it is a complete faff but lasts forever. It's a good thing to get out of the way.