The more that I have considered the issues, the more I have come to accept that this endeavour is like sending humans out into space to create a new colony somewhere...
Consider... You can easily imagine the mission taking several years. You have to ensure that any biosystem that you put in place works - and can handle a few false starts. You have to ensure that you have all the equipment you need, or can make or improvise the things you suddenly find you do. You need as big a knowledge base as possible. You have to ensure that your power supply won't leave you in the dark, or in the cold, or suffocating. You have to have a vessel large enough to do all this, protect its occupants, and get where it's going.
All of this is the technical side of things, and costs a lot to do.
You need to start with a population of people that can get along, has the combined knowledge and experience, and of a size large enough to buffer against losses and protect against inbreeding.
Increase the population from 4 to 400, the costs escalate dramatically.
Ideally, you also don't just send one mission, you have a few.
Each time you add a colony, add each mission cost to the list...
The technical side of things, I can do. I am unashamedly a bibliophile, have post-graduate training in Engineering and Science... various fields, various levels of training, enough to bluff or at least see very interesting things. I hobby farm, so am learning all the things involved in keeping plants productive and alive, am slowly (as time and money allow) putting together a hydroponic system, slowly adding solar, and will add other methods, again as time and money allow. The technical side of things, I can do.
It's the raising money that I'm no good at... Finding people rich enough to convince that this is a worthwhile pursuit - and then convincing them that they need to supply the money... As for convincing people... While I am often the one people turn to when they need to know what to do, I am not blessed with the silver tongue that gathers them around in the first place.