I use mainly familysearch.org for census information but i've also used Freecen.co.uk, Ancestry and FMP.
I have created an area in a spreadsheet for each edition of the census (Ie 1841,1851,1861 etc) so that i just have to copy and paste information out of the familysearch.org page and into the spreadsheet. i make sure all the information lines up and add wikitree ids and then copy the result into the profile with the sourcing all done. I also use a timeline format for the profiles. See
https://www.wikitree.com/wiki/Fewings-91
Maria (Fewings) Dymond (abt. 1829) for example
I use a table format for all the people in the house and the result that I paste into the profile looks like this...
===->1851 Census @ , Chulmleigh, Devon, England===
The England and Wales Census, 1851 for Chulmleigh, Devon, England shows [[Fewings-91|Maria Diamond]] Married Female , aged 22, .
People and details listed at the same address, on the date, 30Mar1851,include:-
{| border="1" class="wikitable sortable"
|Household||Role||Gen||Age||Birthplace||b.(est.)
|-
|[[Dymond-196|George Diamond ]]||Head ||M ||22 ||Chulmleigh, Devonshire||1829
|-
|[[Fewings-91|Maria Diamond ]]||Wife ||F ||22 ||Chulmleigh, Devonshire||1829
|}<ref name='Cen1851' >England and Wales Census, 1851, database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SGBR-CB2 : 24 July 2016), Maria Diamond in household of George Diamond, Chulmleigh, Devon, England; citing Chulmleigh, Devon, England, p. 20, from "1851 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives of the UK, Kew, Surrey.</ref>