As a former professional in conveyancing I will second Rumpled Elf's advice.
There are several aspects of conveyancing:
A. getting the legal title transferred to you. This part is the simple part.
B. ensuring the contract reflects your agreement and is not overly weighted to the vendor
C. ensuring you can use the property for what you intend. In NSW I twice had clients who wanted to purchase vacant land surrounded by houses where the zoning did not permit housing. I had another client want a block where the location of the sewers made it unfeasible to build the building they wanted. The people who eventually bought and built had to build a house with very little frontage.
Just bear in mind the fine print in a standard contract is in NSW explained in a several hundred page book by Professor Butt.
Yes possibly 99% of transactions might not have these compications though bearing in mind the "standard special conditions" a number of NSW lawyers use I think the number would be much less. But you don't know if your transaction is the 1% where there is an issue. Maybe you will do the conveyancing, get the title transferred to you, build and then five or ten years down the track when you come to sell find there is a problem the purchaser's solicitor finds that prevents or delays your sale.