It would not be easy to colonize venus simply because it is a planet that is not fit for humans to live in. It has a very thick atmosphere that is full of carbon dioxide. One breath can be enough to kill humans. It also has a lot of active volcanoes which means that people would need to go through a lot of lava plains if in case they have the right breathing apparatus to survive.
The surface temperature of Venus is said to be hot enough to cause lead to melt. This is going to be a hot and uncomfortable planet. There are no reports yet if there are some things that can be done in order to improve venus’s atmosphere. As of now, there are not enough reports that are available to provide that information.