The best way I know how to effectively use your time and to get a budget done is to use a spreadsheet. Getting starting with a spreadsheet package like Microsoft Excel or Google Sheets may seem a little daunting, but the good news is there are plenty of online video tutorials available to help.
By learning how to use a spreadsheet you will also be able to possess a skill that many in the workplace do not have. Not only will you have an ability on being able to navigate around a spreadsheet, but you will over time be able to know how to analyse and report on data.
As budgeting uses numbers and basic calculations it makes for a perfect fit.
If you want to get started budgeting using a spreadsheet here are some helpful resources: