Which renovations are easy DIY for a condo?

[Dagart Allison]

Currently, I am looking at condos to buy and renovate while I live there. Most of the places I look at have out-dated kitchens, bathrooms, carpet, and popcorn ceiling. The condos I look at are priced under the market value and I hope to add value to the condo through renovation. But of course, if I spend as much as on the upgrades and as the appreciation, I don't make any money. Which features are easy DIY and which are contractor necessary? Also, I do not have any experience in home improvement, other than having painted a room and torn-up carpeting (aka. not-experienced).

Thanks!