I read that it would be more difficult to land (not crash land) on Mercury or even send a spacecraft in orbit around it because of the gravitational pull of the Sun and the lack of planetary atmosphere. Does current technology allow landing a spacecraft on Mercury to study the surface in detail?
The closest we have done thus far is to orbit a spacecraft around Mercury. This was accomplished by a number of flybys first, of Earth, Venus, and Mercury. The mass of Messenger was about 500 kg, minus fuel. The orbit was still highly elliptical. Per this chart, to land on Mercury from that orbit requires about 4200 m/s, roughly. That is an enormous amount, more than any other spacecraft to date has had!
There has been some work towards a lander, however. The closest to succeeding is the BepiColombo mission, which proposed to send a 7 kg lander to Mercury, known as the Mercury Surface Element. The main mission was approved, but the lander was rejected. Approximately 80% of its mass would be fuel. It would land near a pole, to avoid the temperature extremes that come due to the long days.
Bottom line, it might be possible, but it would be very difficult. Messenger was a low cost mission, and was able to orbit it. A lander was proposed, but nixed, due to it's expense and expected relatively little scientific gain.