The reliable way to hire a tradesperson

We will be moving into a property next month with artificial grass in both front and rear gardens. We will be looking into hiring to remove this and replace with grass instead as we prefer real grass. What would a job like this entail? We're keen to understand the process as we have a dog and a toddler so want to ensure any disruption we can plan for / have them out the way if necessary.,

Is it possible to install a staircase for a loft conversion (bungalow) before the work upstairs starts? Reason is i want the stairs in to finish off the downstairs part before moving onto the loft next year. Obviously I won't be able to use them without the dormer above for head height etc and I have a separate loft hatch for access, but would like to fit them if only temporarily. Thanks

I have a builder fitting a shower bath and tiling the walls and floors. Before he arrived I fitted the new basin and toilet myself. It's all been going okay until he asked me to take out the toilet pan so he can put the new tiles on the floor. After back and forth it seem he's unwilling to cut one of the tiles to fit around the toilet because he thinks it will look bad. I am genuinely unable to move the toilet pan for several reasons. Should I try to cut one of the tiles to shape myself for him to fit or should I tell him to not put the floor tiles down and I'll find someone else?