Yes you can get the finish up on the filler primer by hand sanding, it sands really quickly and easily I woudl suggest starting with a 400 grit followed by 800 and then 1200, from here just buff over with the
T10 and you should be ready to go.
Then when it comes to getting the finish up on the mould, the T10 should get you a really good glassy gloss, you could follow it with an even finer compound but it's not normally needed, this can be done by hand, a polishing machine will make it quicker, especially on larger shapes, but it's not a requirment if you're prepared to stick in a bit of elbow grease!
We often find that a pattern has the odd imperfection, rather than worrying about perfection at that stage is is often easier to do a little bit of finishing on the mould, we will often flat a mould with 1500 then 2000 grit paper before compounding this removes any fine scratches and nibs.
I look forward to seeing some pics of your project.
Paul StathamEasy Composites / Carbon Mods - Technical