Do you have children and are you in Scotland, gleno1? I know Scottish inheritance laws are different from those in England & Wales and I'm not sure whether terms of a will are superseded by inheritance laws.
Doing a will yourself is fine as long as the affairs are straightforward (straightforward property issues, no illegetimate children who could come out of the woodwork, no former wives/husbands, no major IHT issues, no family businesses, no trusts, etc).
You also need to make sure it is signed and witnessed properly with signatures being witnessed and where witnesses are not beneficiaries. These wills sometimes fail on technicalities.